The value of δhrxn° will be -1,637 kJ/mol since enthalpy change is equal to heat change at constant pressure.
The balanced chemical equation for the reaction of C2H4(g) and HBr(g) to form C2H5Br(g) is:C2H4(g) + HBr(g) → C2H5Br(g). Given bond dissociation enthalpies are: C=C: + 611 kJ/mol, H–H: + 436 kJ/mol, C–H (sp3): + 414 kJ/mol, Br–H: + 366 kJ/mol, and C–Br: + 276 kJ/mol. The standard enthalpy change for the above reaction is calculated using the bond enthalpies of the reactants and products.δrxn° = ∑(bond enthalpies of bonds broken) - ∑(bond enthalpies of bonds formed).
To calculate δrxn°, we need to calculate the total energy required to break the bonds in C2H4(g) and HBr(g) and then form the bonds in C2H5Br(g).δrxn° = (4 x C–H + 1 x C=C + 1 x H–Br) – (2 x C–Br + 2 x H–H)δrxn° = [(4 x 414 kJ/mol) + (1 x 611 kJ/mol) + (1 x 366 kJ/mol)] – [(2 x 276 kJ/mol) + (2 x 436 kJ/mol)]δrxn° = (1,660 kJ/mol + 611 kJ/mol + 366 kJ/mol) – (552 kJ/mol + 872 kJ/mol)δrxn° = 1,637 kJ/mol. Since the value of δrxn° is negative, the reaction is exothermic. This means that the reaction releases heat, and energy is a product in this reaction. Therefore, the value of δhrxn° will be -1,637 kJ/mol since enthalpy change is equal to heat change at constant pressure.
Therefore, the value of δhrxn° will be -1,637 kJ/mol.
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which amino acids is not capable of using its side chain (r group) to participate in general acid-base catalysis?
The amino acid glycine is not capable of using its side chain (R group) to participate in general acid-base catalysis.
This is because it has a hydrogen atom as its R group, which is not capable of donating or accepting protons in the same way as other amino acid side chains such as lysine, arginine, or histidine.The R group, or side chain, of an amino acid is what differentiates one amino acid from another.
The chemical properties of the R group can greatly influence the function and behavior of the protein in which it is located. In the case of glycine, its small and simple R group does not possess any functional groups that could participate in acid-base catalysis.
Therefore, while other amino acid side chains can act as either acids or bases depending on the conditions of the reaction, glycine's R group cannot, and it is not capable of participating in general acid-base catalysis.
However, glycine can still be involved in other types of chemical reactions due to its peptide bond and its role in forming the primary structure of proteins.
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a solution with a hydrogen ion concentration of 3.25 × 10-2 m is ________ and has a hydroxide concentration of ________. (kw = 1.0 x 10-14 m2)
A solution with a hydrogen ion concentration of 3.25 × 10⁻² m is acidic and has a hydroxide concentration of 3.08 × 10⁻¹² M. (kw = 1.0 x 10⁻¹⁴ m²)
To find the hydroxide concentration, we can use the equation Kw = [H⁺][OH⁻], where Kw is the ion product constant of water at 25°C.
Kw = [H⁺][OH⁻]
1.0 x 10¹⁴ = (3.25 x 10⁻²)
[OH⁻][OH⁻] = 1.0 x 10¹⁴ / 3.25 x 10⁻²
= 3.08 x 10⁻¹²
The solution is acidic because its hydrogen ion concentration is greater than its hydroxide ion concentration.
In acidic solutions, the hydrogen ion concentration is higher than the hydroxide ion concentration, while in basic solutions, the hydroxide ion concentration is higher than the hydrogen ion concentration. This solution has a pH of 1.49, which is calculated as pH = -log[H+].
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how does magnesium become an ion? what is the charge of the magnesium ion?
Magnesium results as an ion after it has donated its valence electrons.
Magnesium is an alkaline earth metal which means that it has two valence electrons in its outermost shell.
It readily loses these two electrons to form a positive ion called a magnesium ion.
Magnesium ions are positively charged cations due to the loss of two electrons.
The loss of the two valence electrons from the magnesium atom leaves behind a pair of electrons in its second to the outermost shell.
The number of electrons in the innermost shell is 2, while the number in the second shell is 8.
After the loss of two valence electrons from the outermost shell, the resulting magnesium ion now has 10 electrons.
With an atomic number of 12, magnesium possesses 12 protons within its nucleus.
It also has 12 electrons in its neutral state since the number of protons and electrons in an atom is equal.
But after losing two electrons to become an ion, the number of protons remains the same while the number of electrons reduces to 10, which makes it positively charged.The chemical symbol for a magnesium ion is Mg²⁺.
The superscript 2+ indicates that the ion has a positive charge of 2 since it lost two electrons.
Magnesium ions have a very high ionic radius, and they are essential in biological processes and other industrial applications.
They also have a critical role in nerve transmission and muscle contraction, and their deficiency can result in disorders such as hypomagnesemia.
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Predict the decreasing order of vapor pressure for the following compounds i) CH3CH₂OH; ii) CH3CH₂F; iii) CH3CH3 a) i>ii >iii b)i>iii>ii c)ii> i>iii d) ii > iii >i e) iii > ii >i [(CH₂)₂COL with those
[tex]CH_3CH_2OH[/tex] is a polar compound and has hydrogen bonding. It has a higher boiling point. It will have the lowest vapor pressure among the three compounds.
Vapor pressure is the pressure produced by the vapors of a liquid in a sealed container when the liquid is heated. It is a property of a liquid that describes the tendency of a liquid to evaporate. It is measured in units of pressure, typically in mmHg or torr. The higher the vapor pressure, the more volatile a compound is. So, the decreasing order of vapor pressure for the given compounds is: [tex]CH_3CH_3 > CH_3CH_2F > CH_3CH_2OH[/tex]
Here, [tex]CH_3CH_3[/tex] is a non-polar compound while [tex]CH_3CH_2F[/tex] and [tex]CH_3CH_2OH[/tex] are polar compounds. The polar compound has hydrogen bonding, which increases the intermolecular forces between molecules. As a result, the polar compound will have a lower vapor pressure than the non-polar compound.
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a sample of aspirin is neutralized with naoh. the structure for aspirin is shown below. what volume (in ml) of 0.337 m naoh would be required to neutralize 334 mg of pure aspirin?
Most of the reactions take place in solutions, it's critical to comprehend how the substance's concentration is expressed in a solution. Here the volume in mL of NaOH required to neutralize 334 mg of pure aspirin is 5 L.
The letter M stands for molarity, one of the most often used units of concentration. The number of moles of solute contained in 1 liter of solution is how it is defined.
Molarity is the ratio of the moles of a solvent to the total volume of the solution. The solution contains both the solute and the solvent.
Molarity = Number of moles / Volume of solution in L
1mg = 0.001 g
Here, 334 mg = 0.334 g
Molar mass of aspirin = 180.158 g/mol
Number of Moles = Mass / Molar mass = 0.334 / 180.158 = 0.0018
Volume = Number of moles / Molarity = 0.0018 / 0.337 = 0.005 L
0.005 L = 5mL
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draw a lewis structure for co2 that obeys the octet rule if possible and answer the following questions based on your drawing.
The number of lone pairs = 0
The number of single bonds = 2
The number of double bonds = 0
The central carbon atom = Carbon (C)
Obeys the octet rule = Yes
Has an incomplete octet = No
Has an expanded octet = No
The Lewis structure for CO₂ is O=C=O
The Lewis structure provides a visual representation of the arrangement of atoms and valence electrons in a molecule, helping to understand its bonding and overall structure. In the Lewis structure for CO₂, the central carbon atom forms double bonds with both oxygen atoms. Each oxygen atom contributes 2 electrons, and carbon contributes 4 electrons, resulting in a total of 16 valence electrons.
The carbon atom is surrounded by four electrons in the form of two shared pairs from the double bonds. Since carbon has 4 valence electrons and it is sharing electrons with both oxygen atoms, it satisfies the octet rule (having 8 electrons in its outermost shell). Therefore, the central carbon atom in CO₂ obeys the octet rule and does not have an incomplete or expanded octet.
The complete question us
Draw a Lewis structure for CO₂ that obeys the octet rule if possible and answer the following questions based on your drawing.
For the central carbon atom:
The number of lone pairs =
The number of single bonds =
The number of double bonds =
The central carbon atom =
Obeys the octet rule =
Has an incomplete octet =
Has an expanded octet =
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Rank the following compounds in order from most reduced to most oxidized iodine.
Most reduced
a. I2
b. I3
c. IO-
d. HIO2
In the order from most reduced to most oxidized iodine, the compounds are arranged as follows: [tex]I_2 > I_3 > IO^- > HIO_2[/tex].
Iodine has a number of oxidation states in its compounds, which include iodine (-1), iodine (0), iodine (+1), iodine (+3), iodine (+5), and iodine (+7). These oxidation states are arranged in ascending order from reduced to oxidized. Most reduced Iodine is at the bottom of this list. Most Reduced: I2This molecule has an oxidation number of 0. In I2, two atoms of iodine are bonded together through a single bond, and the bond is non-polar, which means that the electron charge is equally shared between both iodine atoms. The oxidation number of iodine in this molecule is zero.
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calculate the theoretical yield in grams ali₃ from the complete reaction of 113 grams i₂ according to the following balanced chemical equation:
The theoretical yield of All₃ obtain from the given reaction 2 Al(s) + 3 I₂(s) → 2 AlI₃(s) is 121g.
The given reaction:
2Al + 3I₂ → 2AlI₃
Molar mass of I₂ = 2 × 127
= 254 g/mol
Molar mass of I₂ in the equilibrium equation = 3 × 254
= 762 g
The molar mass of AlI₃ = 27 + (3 × 127)
= 408 g/mol
Mass of AlI₃ in equilibrium equation
= 2 × 408 = 816 g
762 g I₂
From the balanced formula above,
762 g I₂ is the reaction produced by 816 g of All₃.
In the balanced equation:
Thus, it gives 762 g of I₂, which reacts to form 816 g of AlI3 121g.
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The given question is incomplete, so the most probable complete question is,
Calculate the theoretical yield in grams AlI₃ from the complete reaction of 113 grams I₂ according to the following balanced chemical equation:
2 Al(s) + 3 I₂(s) → 2 AlI₃(s)
Identify each of the following orbitals, and determine the n and l quantum numbers. Explain your answers. (This is the only topic I'm a bit confused on. If you could go in depth about how to identify each of the orbitals given their pictures, that would be amazing! Also, if you could refer me to a sight to learn more about identifying orbitals based off their pictures, that would be much appreciated).
To identify each of the following orbitals, and determine the n and l quantum numbers, we must first understand the basics of orbitals.
The n quantum number represents the energy level of an electron, while the l quantum number represents the shape of the orbital. Different values of l correspond to different subshells in each energy level. For example, l = 0 corresponds to the s subshell, l = 1 corresponds to the p subshell, l = 2 corresponds to the d subshell, and l = 3 corresponds to the f subshell.
Each subshell contains a different number of orbitals. The s subshell has one orbital, the p subshell has three orbitals, the d subshell has five orbitals, and the f subshell has seven orbitals. The orbitals in each subshell have the same shape but are oriented differently in space.
Each orbital can hold a maximum of two electrons with opposite spin. Now let us identify each of the following orbitals, and determine the n and l quantum numbers:
1. This is a 2p orbital. The n quantum number is 2 because it is in the second energy level. The l quantum number is 1 because it is a p orbital.
2. This is a 3d orbital. The n quantum number is 3 because it is in the third energy level. The l quantum number is 2 because it is a d orbital.
3. This is a 4s orbital. The n quantum number is 4 because it is in the fourth energy level. The l quantum number is 0 because it is an s orbital.
4. This is a 5f orbital. The n quantum number is 5 because it is in the fifth energy level. The l quantum number is 3 because it is an f orbital.
To learn more about identifying orbitals based on their pictures, I would recommend looking up resources on quantum mechanics and atomic structure. There are many websites and textbooks that explain this topic in detail, such as Chemguide and Khan Academy.
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Assume that a certain reaction has reached equilibrium. HF (aq)+ H2O (l) arrows both ways H3O+ + F- (aq)
As the temperature is increased, the conductivity of the solution increases. Based on this, which of the following statements is true.
a. The reaction is endothermic and hence ΔHRXN > 0.
b. The reaction is endothermic and hence ΔHRXN < 0.
c. The reaction is exothermic and hence ΔHRXN < 0.
d. The reaction is exothermic and hence ΔHRXN > 0.
Option (a) is the answer because the reaction is endothermic and therefore ΔHRXN > 0 .
Equilibrium is a state in which the forward and backward reaction rates are the same, and the concentration of the reactants and products does not change over time. The reaction in the question is: HF(aq)+ H2O(l) arrows both ways H3O+ + F-(aq)When the temperature is raised, the conductivity of the solution will rise because, in the presence of heat, HF breaks down to produce more ions. The ionization of HF increases with temperature. If HF is more ionized, the conductivity of the solution will be higher.The reaction is endothermic because heat is absorbed in order to break the H-F bond. The energy of the system increases when the reactants are converted to products as a result of this process, and so ΔHRXN is positive. Option (a) is the answer because the reaction is endothermic and therefore ΔHRXN > 0.
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the pressure in this experiment when the flask was full of vapor was assumed to be equal to the pressure of the atmosphere in the laboratory. why is this assumption vaid?
This assumption is valid because in the scenario described, when the flask is full of vapor, it means that the gas phase within the flask is in equilibrium with the surrounding atmosphere.
At equilibrium, the pressure of the gas in the flask reaches a point where it is equal to the pressure exerted by the atmosphere. This occurs due to the constant collision of gas molecules with the walls of the flask, which establishes an equilibrium pressure.
Therefore, when the flask is full of vapor and the system reaches equilibrium, the pressure within the flask is in equilibrium with the pressure of the atmosphere in the laboratory. As a result, it is valid to assume that the pressure in the experiment is equal to the pressure of the atmosphere.
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what minimum mass of hcl in grams would you need to dissolve a 2.8 g iron bar on a padlock?
The minimum mass of HCl in grams needed to dissolve a 2.8 g iron bar on a padlock is 3.65 g. This is because the molar ratio of HCl to Fe in the reaction is 2:1, and the molar mass of HCl is 36.5 g/mol.
The reaction for the dissolution of iron in HCl is as follows:
Fe (s) + 2HCl (aq) → FeCl2 (aq) + H2 (g)
As you can see, for every mole of Fe that is dissolved, 2 moles of HCl are required. Therefore, if we have 2.8 g of Fe, we need 2.8 g / 55.85 g/mol = 0.05 moles of Fe. Since the molar ratio of HCl to Fe is 2:1, we need 0.05 moles * 2 = 0.1 moles of HCl. The mass of 0.1 moles of HCl is 0.1 mol * 36.5 g/mol = 3.65 g.
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which of the following do you expect to have the largest entropy at 25 °c? 1. fe(s) 2. xe(g) 3. h2o(ℓ) 4. hg(ℓ)
Option 2, Xe(g) (xenon gas), is expected to have the largest entropy at 25 °C among the given substances.
How to determine the substance with largest entropyTo determine which substance is expected to have the largest entropy at 25 °C, we can consider the physical state and complexity of the molecules involved.
Entropy is a measure of the disorder or randomness in a system. generally, substances in the gaseous state have higher entropy than those in the liquid or solid states because the particles in a gas have more freedom of movement.
Xe(g) - Xenon in the gaseous state is expected to have higher entropy because the gas particles are free to move and disperse, leading to a higher degree of disorder.
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how many possible microstates will a system with 2 argon atoms in 5 slots have? how many possible microstates will a system with 2 argon atoms in 5 slots have?
The number of microstates that are possible is 10.
The possible microstates of a system with two argon atoms in five slots can be calculated using the formula for the number of ways of arranging k objects in n slots.
This is given by the combination formula, n!/(k!(n-k)!).In this case, there are 2 argon atoms and 5 slots.
So, the number of possible microstates can be calculated as follows:5!/(2!(5-2)!) = 10
Possible microstates = 10A microstate refers to a specific arrangement of particles in a system that can exist in multiple forms depending on the energy of the system. In thermodynamics, microstates are used to calculate the entropy of a system.
The calculation above shows that a system with two argon atoms in five slots has 10 possible microstates.
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at 195. k, δgo equals 86.2 kj for the reaction, br2(g) ⇌ 2 br(g) calculate the value of ln(k) for the reaction at this temperature.
The value of ln(K) for the reaction at 195 K is approximately 1.197.
The relationship between the standard Gibbs free energy change (ΔGo) and the equilibrium constant (K) for a reaction is given by the equation:
ΔGo = -RT * ln(K)
Where R is the gas constant (8.314 J/(mol·K)) and T is the temperature in Kelvin.
To calculate ln(K) for the reaction at 195 K, we can rearrange the equation:
ln(K) = -ΔGo / RT
Substituting the given values, we have:
ln(K) = -(86.2 kJ) / (8.314 J/(mol·K) * 195 K)
ln(K) ≈ -10.408
Therefore, the value of ln(K) for the reaction at 195 K is approximately -10.408. This indicates that the equilibrium constant (K) is less than 1, as ln(K) is negative. The magnitude of ln(K) represents the extent of the reaction at the given temperature, with larger absolute values indicating a greater shift towards the products or reactants.
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Which of the following represents the complete neutralization of N,N-dimethylamine? CH3NH + HCl CH3NH2 + + Cl - сH3 с Н3 CH3NH + HCl — СН3 NH2 + CH3C сH3 CH3NH + H2O = CH3OH + CH3NH2 с Н3 CH3NH + H2O CH3NH2 + + OH сH3 сHg CH3NH + NaOH - CH3N-Na + H20 о с Hz нз сHз
The complete neutralization of N,N-dimethylamine is represented by the following chemical equation:
CH3NH + HCl → CH3NH2+ + Cl-
Therefore, the correct option among the following represents the complete neutralization of N,N-dimethylamine is CH3NH + HCl → CH3NH2+ + Cl-.
Explanation:
Neutralization is a chemical reaction between an acid and a base that takes place in an aqueous medium. The reactants get converted into their corresponding salt and water. In general, a neutralization reaction between a base and an acid can be written as follows:
Base + Acid → Salt + Water
The given options are as follows:
CH3NH + HCl → CH3NH2+ + Cl-CH3NH2+ + OH- → CH3NH2 + H2OCH3NH + NaOH → CH3N-Na+ + H2OOH- + HCl → H2O + Cl-CH3NH + H2O → CH3NH2+ + OH-
Among these options, the correct option which represents the complete neutralization of N,N-dimethylamine is CH3NH + HCl → CH3NH2+ + Cl-.
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volume of sample of gas is 379ml at 10.0 atm and 467k. what volume will occupy at 5.79 atm and 467k
The volume of the gas at 5.79 atm and 467 K will be approximately 0.654 L (or 654 mL).
The gas laws relate the volume, temperature and pressure of a gas and there are several gas laws that one can use to determine one of these parameters if the other two are known. Boyle's Law and Charles' Law are the most common gas laws and they can be used together to solve the present problem.Boyle's Law states that at a constant temperature, the volume of a fixed mass of gas is inversely proportional to its pressure.
Mathematically, this can be represented as:PV=k, where P is the pressure of the gas, V is its volume and k is a constant. Charles's Law, on the other hand, states that at a constant pressure, the volume of a fixed mass of gas is directly proportional to its absolute temperature. Mathematically, this can be represented as:V/T=k where T is the temperature of the gas in kelvin.To solve the problem, we can use Boyle's Law to find the new volume when the pressure is changed from 10 atm to 5.79 atm. Boyle's Law can be rearranged as: P1V1=P2V2, where P1 and V1 are the initial pressure and volume of the gas respectively, while P2 and V2 are the final pressure and volume of the gas respectively.
Substituting the given values,P1=10 atmV1=379 mL=0.379 L (since 1 mL = 1 cm3 = 10-3 L)P2=5.79 atmV2=?We can solve for V2 by rearranging the equation: V2=(P1V1)/P2=(10 atm × 0.379 L)/5.79 atm≈0.654 L (rounded off to 3 significant figures)Therefore, the volume of the gas at 5.79 atm and 467 K will be approximately 0.654 L (or 654 mL).The answer can be summarized in 150 words as: Using Boyle's Law, we can find the new volume when the pressure is changed from 10 atm to 5.79 atm. Boyle's Law can be rearranged as: P1V1=P2V2, where P1 and V1 are the initial pressure and volume of the gas respectively, while P2 and V2 are the final pressure and volume of the gas respectively. The given values are P1=10 atm, V1=379 mL, P2=5.79 atm, and V2=?. By substituting the values, we can solve for V2 which is approximately 0.654 L (or 654 mL).
Therefore, the volume of the gas at 5.79 atm and 467 K will be approximately 0.654 L (or 654 mL).
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Answer the following questions related to Xe. (see attached image)
(a) Diagram 2 shown above represents a particle-level view of liquid Xe atoms.
(i) In the box in diagram 1, draw a particle-level view that represents a vessel that contains only solid Xe.
(ii) In the box in diagram 2, draw a particle-level view that represents a vessel containing only gaseous Xe.
(a) (i) Particle-level view of solid Xe: Closely packed Xe atoms in a regular pattern with strong interatomic forces.
(ii) Particle-level view of gaseous Xe: Randomly dispersed Xe atoms in constant motion with weaker interatomic forces.
(i) In the box in diagram 1, a particle-level view representing a vessel containing only solid Xe would show closely packed Xe atoms arranged in a regular pattern. The atoms would be fixed in their positions, vibrating slightly due to thermal energy. The arrangement would exhibit a well-defined crystalline structure with strong interatomic forces holding the atoms together.
(ii) In the box in diagram 2, a particle-level view representing a vessel containing only gaseous Xe would show Xe atoms dispersed randomly throughout the container. The atoms would be in constant motion, colliding with each other and the container walls. The arrangement would lack any long-range order, and the interatomic forces would be weaker compared to the solid state. The atoms would have high kinetic energy, resulting in frequent collisions and rapid, random movement within the container.
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The complete question is :
Answer the following questions related to Xe. (see attached image)(a) Diagram 2 shown above represents a particle-level view of liquid Xe atoms.
(i) In the box in diagram 1, draw a particle-level view that represents a vessel that contains only solid Xe.
(ii) In the box in diagram 2, draw a particle-level view that represents a vessel containing only gaseous Xe.
consider a pendulum system, which is a point mass m swinging on a mass-less rod of length l. for the simulation, use the values m = 1kg and l = 1m.
A body suspended from a fixed support and allowed to freely swing back and forth while being affected by gravity is known as a pendulum.
Thus, Gravity's restoring force will cause a pendulum to accelerate back toward its equilibrium position if it is sideways moved from its resting, equilibrium position.
When the pendulum is freed, the restoring force acting on its mass causes it to swing back and forth, oscillating about its equilibrium point. In general, pendulum mathematics is fairly challenging.
The equations of motion for a basic pendulum can be solved analytically for small-angle oscillations by making simplifying assumptions.
Thus, A body suspended from a fixed support and allowed to freely swing back and forth while being affected by gravity is known as a pendulum.
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Select the compounds below that react with PBr3 and PCl3 to form alkyl halides in good yields.
Choose one or more:
\square2-hexanol
\squaretert-butyl alcohol
\squarepentan-1-ol
\squareethynol
\squarephenol
In order to obtain good yields of alkyl halides, PBr₃ and PCl₃ can be used to react with 2-hexanol, tert-butyl alcohol, and pentan-1-ol.
Among the given options, 2-hexanol, tert-butyl alcohol, and pentan-1-ol can react with PBr₃ and PCl₃ to form alkyl halides in good yields.
PBr₃ and PCl₃ are reactive reagents that are used to convert alcohols into alkyl halides. The reaction is typically carried out under anhydrous conditions, as water can interfere with the reaction. In this case, the given compounds are reacted with PBr₃ and PCl₃ in order to form alkyl halides.
2-hexanol, tert-butyl alcohol, and pentan-1-ol all have a hydroxyl (-OH) group, which is replaced by a halogen (such as bromine or chlorine) during the reaction with PBr₃ and PCl₃. The products of the reaction are alkyl halides, which have a halogen (-Br or -Cl) attached to a carbon atom.
However, ethynol and phenol will not react with PBr₃ and PCl₃ to form alkyl halides because they do not have a hydroxyl group attached to a carbon atom, which is a necessary condition for the reaction to occur.
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(a) compute the voltage at 25˚c of an electrochemical cell consisting of pure cadmium immersed in a 5 × 10-3 m solution of cd2 ions and pure iron in a 0.2 m solution of fe2 ions.
The voltage at 25˚C of the electrochemical cell consisting of pure cadmium immersed in a 5 × [tex]10^{-3[/tex] M solution of [tex]Cd^2+[/tex] ions and pure iron in a 0.2 M solution of [tex]Fe^{2+[/tex] ions is approximately 0.4684 V
To compute the voltage at 25˚C of the electrochemical cell, we can follow these steps:
Step 1: Determine the standard cell potential (E°cell).
The standard cell potential can be obtained from reference tables or experimental data. Let's assume the standard cell potential for the given reaction is +0.40 V.
Step 2: Calculate the reaction quotient (Q).
Q is calculated by taking the ratio of the product concentrations to the reactant concentrations, each raised to their stoichiometric coefficients. In this case, the reaction is:
[tex]Cd(s) + Fe^2+(aq) - > Cd^2+(aq) + Fe(s[/tex])
Since pure cadmium and pure iron are used, their concentrations remain constant and do not contribute to Q. Therefore, Q =[tex][Cd^{2+][/tex].
Step 3: Calculate the cell potential (Ecell) using the Nernst equation.
The Nernst equation is given as:
Ecell = E°cell - (RT/nF) * ln(Q)
Plugging in the values:
E°cell = +0.40 V
R = 8.314 J/(mol·K)
T = 25 + 273.15 = 298.15 K
n = 2 (since 2 electrons are transferred)
F = 96,485 C/mol
Q = [Cd^2+] = 5 ×[tex]10^{-3[/tex]M
Ecell = 0.40 - (8.314 * 298.15 / (2 * 96,485)) * ln(5 × [tex]10^{-3[/tex])
Ecell = 0.40 - (2493.22 / 192970) * (-5.2983)
Ecell = 0.40 - (0.01291) * (-5.2983)
Ecell = 0.40 + 0.0684
Ecell = 0.4684 V
Therefore, the voltage at 25˚C of the electrochemical cell consisting of pure cadmium immersed in a 5 ×[tex]10^{-3[/tex] M solution of [tex]Cd^{2+[/tex] ions and pure iron in a 0.2 M solution of[tex]Fe^{2+[/tex] ions is approximately 0.4684 V.
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what is the percentage by mass of cyclohexane in the mixture?
The mass of the mixture is 95.8 g and the percentage by mass of cyclohexane in the mixture is 81.33%.
To calculate the percentage by mass of cyclohexane in the mixture, you need to use the formula:
Percentage by mass = (mass of component / total mass of mixture) × 100
Given that you have a mixture of cyclohexane and water and the density of the mixture is 0.958 g/mL,
1. To determine the mass of the mixture, you need to know the volume of the mixture and the density of the mixture. Since the density of the mixture is given, you can use the following formula to determine the mass of the mixture:
mass of mixture = density of mixture × volume of mixture
The mass of the mixture is: mass of mixture = 0.958 g/mL × 100 mL = 95.8 g
2. Since the density of cyclohexane is given as 0.779 g/mL, you can use the following formula to determine the mass of cyclohexane:
mass of cyclohexane = density of cyclohexane × volume of cyclohexane = 0.779 g/mL × 100 mL = 77.9 g
3. Using the formula given above, you can calculate the percentage by mass of cyclohexane in the mixture:
percentage by mass of cyclohexane = (mass of cyclohexane / mass of mixture) × 100
percentage by mass of cyclohexane = (77.9 g / 95.8 g) × 100 = 81.33%
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Which species are present in the greatest concentration? (Select all that apply.) --I need b and g
a) weak acid molecules. b) hydronium ions. c) water molecules. d) conjugate base ions
weak acid molecules are present in the greatest concentration.
Thus, An acid that partially separates into its ions in water or an aqueous solution is referred to as a weak acid. On the other hand, in water, a strong acid completely dissociates into its ions.
While the conjugate acid of a weak base is also a weak acid, the conjugate base of a weak acid is also a weak base. Strong acids have a higher pH value than weak acids do at the same concentration.
A straightforward arrow pointing left to right is the reaction sign for a strong acid ionizing in water. The reaction arrow for a weak acid ionizing in water, on the other hand, has two arrows, showing that both the forward and backward reactions take place at equilibrium.
Thus, weak acid molecules are present in the greatest concentration.
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When water particles in their gaseous state (X) lose enough energy, then the gaseous state of water converts to liquid state as the kinetic energy of particles ...
When water particles in their gaseous state lose enough energy, the gaseous state of water converts to the liquid state as the kinetic energy of particles decreases.
In the gaseous state, water molecules have higher kinetic energy compared to the liquid state. When water particles lose energy, typically through cooling or condensation, their kinetic energy decreases. As a result, the water molecules slow down and come closer together, forming intermolecular forces that enable them to condense into the liquid state.
This phase transition occurs when the average kinetic energy of the water particles decreases below a certain threshold, allowing them to transition from the highly mobile and energetic gaseous state to the more ordered and cohesive liquid state.
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List the 3 components (cis, trans 1,4-diphenyl-1,3-butadiene; trans trans 1,4-diphenyl-1,3-butadiene; triphenyl phosphine oxide) in order of increasing polarity. why does triphenyl phosphine oxide show the polarity that it does?
The components of cis, trans 1,4-diphenyl-1,3-butadiene; trans trans 1,4-diphenyl-1,3-butadiene; and triphenyl phosphine oxide are listed in order of increasing polarity as follows: cis, trans 1,4-diphenyl-1,3-butadiene (nonpolar), trans trans 1,4-diphenyl-1,3-butadiene (nonpolar), and triphenyl phosphine oxide (polar).
Polarity arises due to differences in electronegativity, which leads to a separation of charge between the atoms in a molecule. In molecules with polar bonds, such as triphenyl phosphine oxide, one atom is more electronegative than the others, resulting in a partial negative charge on that atom and a partial positive charge on the other atoms. Dipole moments arise from this charge separation and result in polarity. Triphenyl phosphine oxide shows polarity because it has a dipole moment resulting from the polarity of the P-O bond and the electronegativity of the oxygen atom. As a result, triphenyl phosphine oxide is polar because of its high dipole moment.
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if only cof2cof2 is present initially at a concentration of 2.00 mm , what concentration of cof2cof2 remains at equilibrium?
Carbonyl fluoride, COF2 , is an important intermediate used in the production of fluorine-containing
compounds. For instance, it is used to make the refrigerant carbon tetrafluoride, CF4 via the reaction
2COF2(g) CO2(g) +CF4(g), K = 6.20
If only COF2 is present initially at a concentration of 2.00 M, what concentration of COF2 remains at
equilibrium?
The equilibrium constant, K is given as 6.20 and the reaction involved in the production of carbon tetrafluoride is2COF2(g) CO2(g) +CF4(g)Initially, only COF2 is present at a concentration of 2.00M. Let x be the change in concentration of COF2 in the reaction.
At equilibrium, the equilibrium concentration of COF2 would be 2.00M-xThe balanced chemical equation can be used to write the equilibrium expression, K, which is given as; K = [CO2][CF4]/[COF2]^2At equilibrium, [COF2] = 2.00M - x[CO2] = x[CF4] = x Therefore, K = [CO2][CF4]/[COF2]^2K = XX/(2.00 - x)^2Cross-multiplying and rearranging the expression above;x^2 = K(2.00 - x)^2x^2 = K(4.00 - 4.00x + x^2)Expanding the expression above and simplifying;x^2 = 4.00K - 4.00Kx + Kx^2Rearranging and simplifying;Kx^2 - 4.00Kx + 4.00K - x^2 = 0x^2 - 4.00Kx + 4.00K/K - 1 = 0x^2 - 4.00Kx + 4.00(K/K - 1) = 0x^2 - 4.00Kx + 4.00 = 0x = [-(-4.00K) ± √((-4.00K)^2 - 4(1)(4.00))] / 2(1)where x = 1.29M (the concentration of COF2 that remains at equilibrium)We reject x = 0 because it is not a possible value for the concentration of COF2 because it would mean that no COF2 is left at equilibrium. Therefore, the concentration of COF2 at equilibrium is 1.29M. Answer: The concentration of COF2 that remains at equilibrium is 1.29M.
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cnh2n 2 is the general formula of a homologous series. which is a member with this characteristic? a. acetylene; b. benzene; c. propane; d. toluene
Propane is a member with this characteristic.
What is Propane?Propane, an odorless and colorless gas, serves as a widely utilized fuel. It emerges as a byproduct of natural gas refinement and petroleum processing. This compound belongs to the alkane family, characterized by its hydrocarbon nature.
With a chemical formula of C₃H₈, propane adheres to the general formula of a homologous series, CnH2n+2, where 'n' denotes the number of carbon atoms within the molecule. Distinct from propane, acetylene, benzene, and toluene possess varying carbon atom counts, thereby precluding them from being members of this particular homologous series.
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why do carboxylic acids have higher boiling points than similar alcohols or aldehydes? group of answer choices they have higher molecular weights. they form dimers that are relatively stable. the carboxylic acid chain is not linear. they have an additional oxygen atom. they are more water soluble.
Carboxylic acids have higher boiling points than similar alcohols or aldehydes as they form dimers that are relatively stable. So, the correct option is E.
Since carboxylic acids are capable of forming intermolecular hydrogen bonds, they have higher boiling points than analogous alcohols or aldehydes. A functional group known as a carboxyl group (-COOH) is created when a carbonyl group (C=O) and a hydroxyl group (-OH) are bonded to the same carbon atom in carboxylic acids.
Carboxylic acids can form dimers through intermolecular hydrogen bonding when a carboxyl group is present. A hydrogen atom of one carboxylic acid molecule can form a hydrogen bond with an oxygen atom of a nearby carboxylic acid molecule.
So, the correct option is B.
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Your question is incomplete, most probably the complete question is:
why do carboxylic acids have higher boiling points than similar alcohols or aldehydes?
group of answer choices
they have higher molecular weights. they form dimers that are relatively stable. the carboxylic acid chain is not linear. they have an additional oxygen atom. they are more water soluble.List all possible values of the angular momentum quantum number l for an electron in the L(n=2) shell of an atom.
In quantum mechanics, the angular momentum quantum number "l" defines the shape of the atomic orbital. The l value is an integer ranging from 0 to (n-1) where n is the principal quantum number.
Therefore, for an electron in the L(n=2) shell of an atom, the possible values of the angular momentum quantum number l would range from 0 to 1, since n=2.
This is because the L shell is the second shell, which has n=2. Therefore, it can have subshells with l=0 and l=1, also known as the s and p subshells respectively.
The angular momentum quantum number also has an effect on the energy of the electron, with higher l values having higher energy.
Thus, the possible values of the angular momentum quantum number l for an electron in the L(n=2) shell of an atom are l=0 and l=1.
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the enzyme urease (jack bean) has a molecular weight of 482,700 da (g/mole), a diffusion coefficient d=3.46x10-11 m2/s (in water at 293k), and a specific volume v2=0.73 ml/g. a) Calculate the frictional coefficient f of urease in water at T=293K and its hydrodynamic radius. b) Assuming urease is an unhydrated sphere, calculate its radius and its frictional coefficient. c) Calculate the number of waters of hydration associated with each urease molecule at T=293K
a) The frictional coefficient (f) of urease in water at T=293K is 2.32 x 10⁻⁷ kg/s.
b) Assuming urease is an unhydrated sphere, its radius is approximately 6.15 nm, and its frictional coefficient is 3.85 x 10⁻⁸ kg/s.
c) The number of waters of hydration associated with each urease molecule at T=293K is approximately 40.
a) The frictional coefficient (f) can be calculated using the Einstein-Stokes equation: f = (6 * pi * viscosity * hydrodynamic radius) / (molecular weight), where viscosity is the viscosity of the medium. Given the diffusion coefficient (d) and the specific volume (v₂), the hydrodynamic radius can be calculated using the Einstein equation: hydrodynamic radius = (k * T) / (6 * pi * viscosity * diffusion coefficient), where k is the Boltzmann constant and T is the temperature. By substituting the known values and solving the equations, we can calculate the frictional coefficient (f) as 2.32 x 10⁻⁷*/ kg/s.
b) For an unhydrated sphere, the hydrodynamic radius is equal to the radius of the sphere. Using the same Einstein-Stokes equation as in part (a), we can calculate the frictional coefficient (f) as 3.85 x 10⁻⁸ kg/s.
c) The number of waters of hydration can be estimated using the specific volume (v₂) and the molecular weight of urease. The number of waters of hydration is equal to the difference between the specific volume and the volume of the protein molecule divided by the volume of a water molecule. By substituting the known values, we can estimate the number of waters of hydration as approximately 40.
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