Lewis structure for acetamide, CH3CONH2. four (4) are the electron-pair geometry and molecular geometry around the two C atom. Sp3d2 is the hybridization of each of the C atoms.
When the valence bond theory failed to accurately predict molecular structure, hybridization was used to explain it. Organic compounds' bond angles have been experimentally found to be near to 109o, 120o, or 180o. The Valence Shell Electron Pair Repulsion (VSEPR) theory states that because electron couples resist one another, the bonds and lone pairs surrounding a core atom are often spaced apart at their greatest angles. The behavior of electrons inside of molecules is modeled using orbitals. Since the hydrogen atom is the only neutral atom for which the Schrödinger equation can be precisely solved, this approximation for simple hybridization is based on atomic orbitals that are similar to those found for that atom. The 2s and 2p atomic orbitals, which are akin to the excited state orbitals for hydrogen, are utilised in heavier elements including carbon, nitrogen, and oxygen. It is believed that hybrid orbitals are combinations of atomic orbitals that are overlaid on one another in different ratios.
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Now that we have a balanced chemical
equation, we can use it to answer questions.
2C₂H6 + 702 → 4CO₂ + 6H₂O
Let's say you asked how many moles of O2
are needed to react with 24 moles of C₂H6.
Let's begin by setting up this problem. What
would you put in the green box?
24 moles C₂H6 | [?] moles 0₂
2 moles C₂H6
To react with Ethane, we need 84 moles of oxygen are required.
What are moles?Moles are the smallest units of measurement for small entities such as molecules, atoms, or particles.A sample of 12 grams of carbon is equal to one mole, and we know that there are 12 numbers in a dozen. As a result, we compared mole to a dozen.The reaction is depicted as follows:
2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O
According to the reaction, the mole ratio of ethane (C₂H₆) to oxygen (O₂) is 2:7.
We have to find the moles of oxygen.
Given that 24 moles of ethane.
24 x 7/2
= 84
As a result, it takes 84 moles of oxygen to react with 24 moles of ethane.
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5. in this experiment, 1.0 ml of saturated sodium chloride is used to rinse the hickman head after the initial distillation. why is saturated sodium chloride, rather than pure water, used for this procedure and the subsequent washing of the organic layer?
Saturated sodium chloride is used in this procedure because it helps to separate the organic layer from the aqueous layer.
What is organic layer?
Organic layer is a type of soil layer that includes organic matter such as leaves, wood, roots, and other plant and animal remains. This type of soil is important for agricultural production and is also beneficial to the environment. Organic layer is also known as top soil or humus. It is the most fertile and nutrient rich soil layer, due to the presence of the decomposing organic matter. Organic layer helps to regulate soil temperature and moisture, improve soil structure and aeration, and provide essential nutrients for plant growth. It also helps to reduce erosion, improve water-holding capacity, and keep soil particles in place. Organic layer also helps to increase the biodiversity of the soil, as it provides a habitat for beneficial microorganisms and other organisms. Organic layer is an important part of any healthy soil system.
The sodium chloride solution has a higher density than water and helps to ensure that the two layers remain distinct. Additionally, the sodium chloride helps to break the surface tension between the two layers, making it easier to separate them.
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classify each molecular art as an element or a compound.
In the given molecular art options, option B and F are elements and option A, C, D and E are compounds.
Elements refer to pure substances which are composed of only one type of atom. It refers to a class of substances that cannot be separated into simpler substances by chemical means. In the given molecular structures, option B and F are elements as they made up of single type of atoms. Compounds refer to substances which are formed by two or more different types of elements that are united chemically in fixed proportions. When the elements combine together, they react with each other and form chemical bonds as a result of sharing or exchanging electrons between atoms which are difficult to break. As molecular structures, option A, C, D and E are made up of different type of atoms, they are compound.
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determine the net change in nadh , fadh2 , and gtp from the passage of two acetyl-scoa molecules through the citric acid cycle. degradation of one molecule of glucose yields two acetyl-scoa molecules.
The net change in NADH , FADH2 , and GTP is : NADH : 6 molecules, FADH2 : 2 molecules, and GTP : 2 molecules.
The citric acid cycle is the also called as the krebs cycle. it is also called as the TCA cycle. it is the series of the chemical reactions occurs to release the energy that is stored through the oxidation of the acetyl CoA. the net change in NADH , FADH2 , and GTP from the passage of two acetyl-CoA molecules through the citric acid cycle. degradation of one molecule of glucose yields two acetyl-CoA molecules.
The NADH = 6 molecules
The FADH2 = 2molecules
The GTPP = 2 molecules
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how many electrons are in antibonding molecular orbitals based on the molecular orbital diagram for o2 given that each o electron configuration is (2s22p4)? do not include electrons from the 1s shell in your count.
There are 8 electrons from each oxygen atoms. Hence oxygen molecule contains a total of 16 electrons in which 10 are bonding and 6 are antibonding electrons.
What are molecular orbital theory?According to the molecular orbital theory, atomic orbitals overlaps to form molecular orbitals. Molecular orbitals are of different identity from that of atomic orbitals. There are both bonding and antibonding molecular orbitals.
The molecular orbital electronic configuration of oxygen molecule is written as :
[tex]\sigma 1s^{2} , \sigma^{*} 1s^{2}, \sigma 2s^{2} ,\sigma^{*} 1s^{2} , \pi2px^{2}, \pi2py^{2}, \sigma 2pz^{2}, pi2px^{1}, \pi2py^{1}[/tex].
There are total 16 electrons in which 10 are in bonding electrons and 6 are non-bonding electrons.
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a sample contains 116.9 grams of nacl dissolved in 1.0 l of water. what is the molarity of this solution?
The molarity of a solution of 116.9g of Nacl in 1l water is 2M.
What is molarity of a solution?
A solute's molar concentration is the quantity of that solute in one unit of a solution. It can be measured in mol/L, mol/dm3, or mol/m3. Molarity is the number of moles of solute present per liter of solution
Here,
We know molarity of a solution = moles of solute/litres of a solution
No of moles in 116.9g of nacl=2 (since 1 mole of Nacl=58.5g)
Volume of water= 1l
Therefore molarity of the solution is 2mol/1l= 2M
Hence the molarity of a solution of 116.9g of Nacl in 1l water is 2M.
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How many grams of iron could be
recovered from 80.0 g of an ore that is known to be 76.0 % Fe3O4?
Answer:
43.8 g of iron can be recovered
Explanation:
First get the mass of Fe3O4 in the ore:
80g Ore * (76 g Fe3O4 / 100 Ore) = 60.8 g Fe3O4
Then get number of moles of Fe3O4:
60.8 g Fe3O4 * 1 mol / 231.535 g = 0.262 mol Fe3O4
**231.535 g is the molar mass of Fe3O4
Then get number of moles of Fe:
0.262 mol Fe3O4 * (3 Fe / 1 Fe3O4) = 0.786 mol Fe
** 3 atoms of Fe in every Fe3O4
Finally convert moles of Fe to grams of Fe:
0.786 mol * 55.845 g/mol = 43.79 g Fe --round to 3 sig figs--> 43.8 g Fe
you are carrying out an experiment to determine the mw of a solid acid with the generic formula h3a. you weigh out 0.630 g of the solid acid in a weigh boat and transfer it to a 125 ml erlenmeyer flask. after dissolving the acid in 25 ml of distilled water, you add 15.44 ml of 0.335 m sr(oh)2 (aq) solution with a buret until your indicator changes color at the equivalence point. what is the mw of the solid acid in units of g/mole?
The molecular weight of the solid acid in units of g/mole is 25 g/mol
given that :
mass of the solid acid =0.630 g
volume = 40.4 mL = 0.04 L
moles = molarity × volumes in liter
moles = 0.630 × 0.04 L
= 0.0252 mol
the molar mass formula is given as:
molar mass = mass / moles
molar mass = 0.630 g / 0.0252 mol
molar mass = 25 g/mol
Thus, carrying out an experiment to determine the mw of a solid acid with the generic formula H₃A. you weigh out 0.630 g of the solid acid in a weigh boat and transfer it to a 125 ml Erlenmeyer flask. after dissolving the acid in 25 ml of distilled water, you add 15.44 ml of 0.335 m Sr(OH)₂(aq) solution . the molecular weight of the solid acid in units of g/mole is 25 g/mol.
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What is the condensed structural formula for 2, 2-dimethylbutane?
Answer:
CH₃C(CH₃)₂CH₂CH₃
Explanation:
2,2-Dimethylbutane has a four-carbon chain with two methyl groups on C-2. The condensed structural formula is CH₃C(CH₃)₂CH₂CH₃. Note that the two CH₃ groups are enclosed in parentheses after the carbon atom to which they are attached.
how much heat is absorbed or released in the reaction of 20.0 g of nh3 with sufficient oxygen to produce no (g) and h2o (l)?
1062.3 KJ heat is absorbed or released in the reaction of 20.0 g of nh3 with sufficient oxygen to produce no (g) and h2o (l).
The heat absorbed or released in the reaction of 20.0 g of NH3 with oxygen to produce NO and H2O depends on the specific conditions of the reaction and the enthalpy change associated with the reaction.
The general equation for the reaction of NH3 with oxygen to produce NO and H2O is:
4NH3 + 5O2 -> 4NO + 6H2O
The enthalpy change for this reaction, which is the heat absorbed or released during the reaction, can be calculated using the enthalpy changes of formation of the reactants and products. The enthalpy change of formation is the heat absorbed or released when a substance is formed from its elements in their standard states.
The enthalpy change of formation of NH3 is -46.2 kJ/mol, the enthalpy change of formation of O2 is 0 kJ/mol, the enthalpy change of formation of NO is +90.3 kJ/mol, and the enthalpy change of formation of H2O is -285.8 kJ/mol.
To calculate the enthalpy change for the reaction, we can use the following equation:
ΔH = (4 x -46.2 kJ/mol) + (5 x 0 kJ/mol) - (4 x +90.3 kJ/mol) - (6 x -285.8 kJ/mol)
This gives us an enthalpy change of -902.8 kJ/mol.
To convert this to the heat absorbed or released for 20.0 g of NH3, we need to multiply by the number of moles of NH3 used in the reaction. The molar mass of NH3 is 17.0 g/mol, so 20.0 g of NH3 is equal to
20.0 g / 17.0 g/mol = 1.18 moles of NH3.
The heat absorbed or released in the reaction of 20.0 g of NH3 with oxygen to produce NO and H2O is therefore -902.8 kJ/mol x 1.18 moles = -1062.3 kJ.
This means that the reaction absorbs 1062.3 kJ of heat from the surroundings.
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Select the vibrations that should be infrared active. CH;` CH,CHCHC_CH, the C=C stretch CH;` CHCHC_CCHCHC CH;, the C=C stretch (CH;C CH2h ' C=O, the C=0 stretch trans-4-octene, the C=C stretch (CH3)3C-C1, the €-Cl stretch
A change in the molecule's dipole moment brought on by vibrations caused by IR radiation absorption is required for a molecule to be IR active.
(Dipole moment = 2*charge × length)
1. Here C=O is already a polarized bond due to the difference in electronegativities of C and O. Hence the C=O stretch is IR active since the vibrations from absorbing IR radiations will change the dipole moment of the molecule
2. Since both sides of the carbon triple bond is different, effective charge on both carbons will be different and hence the vibrations will cause change in dipole moment of the molecule which makes the molecule IR active
3. Here both sides of the carbon triple bond are same(symmetrical molecule) the effective charge on both sides are same hence vibrations will not change the dipole moment and hence the molecule is IR inactive
4. C-Cl bond is already polarized, so a dipole moment already exists and vibrations upon IR absorption will change the dipole moment of the molecule. Hence the molecule is IR active
5. Trans-3-hexene is a symmetrical molecule hence the vibrations along C=C will not cause a change in the dipole moment of the molecule . Hence the molecule is IR inactive
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Draw a correct Lewis structure for XeI2 (Xe in middle, surrounded by I's ) that puts a 0 formal charge on all atoms. How many lone pairs (unshared pairs) are on the central atom? --------------------------------------------------------------------------------------------------------------------------------------------------- 2) A 0.3876 gram sample of a gaseous compound occupies 142 mL at 150 degrees C and 775 torr. What is the molar mass of the compound? Assume ideal behavior. M = dRT/P M = molar mass Hint: you must convert torr to atm 760 torr = 1 atm Hint: you must convert oC to K by adding 273 Hint: you must convert mL to L
On the Xenon atom (Xe) and both of the Iodine atoms, there are three lone pairs and the molar mass of sample is 86.83g/mole..
(a) The central Xenon atom (Xe) of the XeI2 Lewis structure is surrounded by two Iodine atoms. The Xenon atom (Xe) and each iodine atom are connected by two single bonds.
(b) Given that a gaseous sample's mass(m) is 0.3876 grams.
This sample's volume (v) is 142 ml, = 0.142 L, and its temperature (t) is 150 °C, = 150 + 273 , = 423 K
pressure (p) equals 1.09174 atm or 775 torr.
As a result of the equation pv = nRt, n=m/M and M = mRt/pv, which equals 0.3876x0.0821x423/1.0917x0.142, = 13.46068908/0.1550214, = 86.83g/mole.
The resulting molar mass is 86.83g/mole.
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c22- lewis structure
There are a total of 10 valence electrons in the C2²⁻Lewis structure. Each carbon atom contributes four valence electrons, while the second atom adds two more for a total of 10 valence electrons. The two Carbon atoms' octets in the Lewis structure of C2²⁻ must be filled with a triple bond.
How many unpaired electrons are in C2²?
There aren't any unpaired electrons in it.
How many electrons are present in C2²?
Twelve electrons make up the C2 molecule.
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Which of these elements has the same number of valence electrons as neon Ne?a. carbon (C). b. phosphorus (P). c. nitrogen (N). d. oxygen (O)
Answer:
C. Nitrogen (N) has the same number of valence electrons as neon Ne. Both elements have a total of 8 valence electrons in their outermost energy level.
Explanation:
The element neon has the atomic number 10, which means it has 10 electrons in its outermost energy level. The element that has the same number of valence electrons as neon is therefore also the element that has the atomic number 10, which is neon itself. The other elements listed (carbon, phosphorus, nitrogen, and oxygen) have atomic numbers 6, 15, 7, and 8 respectively, so they do not have the same number of valence electrons as neon.
The active site of chymotrypsin is made up of Choose one: A. Asp 102 and His57 from the A chain and Ser 195 from the C chain. B. Asp 102 and Ser195 from the B chain and His57 from the C chain. C. Asp 102 and His57 from the A chain and Ser195 from the B chain. D. Asp 102 and His57 from the B chain and Ser195 from the C chain.
Previous question
Option D-Asp 102 and His 57 from the B chain as well as Ser 195 from the C chain make up the active site of chymotrypsin.
Chymotrypsin (EC 3.4.21.1, chymotrypsins A and B, alpha-chymar ophth, avazyme, chymar, chymotest, enzeon, quimar, quimotrase, alpha-chymar, alpha-chymotrypsin A, alpha-chymotrypsin) is a digestive enzyme that works in the duodenum to degrade proteins and polypeptides by a process called Chymotrypsin preferentially breaks peptide amide bonds when the side chain of the amino acid at the P1 position, which is N-terminal to the scissile amide bond, is a big hydrophobic amino acid (tyrosine, tryptophan, and phenylalanine). These amino acids have an aromatic side chain that fits into an enzyme's hydrophobic pocket (the S1 location). When trypsin is present, it becomes active. The hydrophobic and form complementarity between the enzyme S1 binding cavity and the P1 side chain of the peptide substrate accounts for.
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When methanol dissolves in water; intermolecular forces (IMFs) are formed between the solute and solvent molecules H~ TTH H_0-H methanol (CH3OH) water (HzO) Which intermolecular force below properly identifies the predominant IMF between the methanol molecules and the water molecules in the solution? dispersion interaction dipole-dipole interaction hydrogen bonding ion-dipole interaction ion-ion interaction
1.answer --->In methanol and water hydrogen bonding is present. 2.answer------>level of liquid in left arm is increases. Because solvent flows towards solution through semipermeable membrane during osmosis. 3.answer---->order of reaction with respect to [NO ] is 2, When methanol dissolves in water; intermolecular forces (IMFs) are formed between the solute and solvent molecules H~ TTH H_0-H methanol (CH3OH) water (HzO)
Methanol, the most basic form of alcohol (CH3OH), serves as the chemical basis for countless items used in daily life, such as paints, plastics, automobile components, and building supplies. In addition, methanol is a clean energy source that powers fuel cells, boilers, ships, vehicles, trucks, buses, and cook stoves. Methanol is a highly toxic substance. For a youngster, even 2 tablespoons (30 milliliters) can be fatal. Adults can die from drinking as little as 2 to 8 ounces (60 to 240 milliliters). Despite medical intervention, blindness is frequently permanent.
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how does the graph of a system of equations with one solution differe from the graph of a system of equations with infinetly many solutions or no solutions
The assertion claims that the graphs of a subject with an unlimited number of options is a single statement.
The use of equations in chemistry:Reaction equation demonstrate the end results of reactions as well as their formation. They are helpful in predicting reaction products. We can anticipate the outcome of the reaction between magnesium (a metal) and hydrochloric (a acid, of course!) using this method.
How are chemical equations created?In between the formulas of the reactants, a plus (+) symbol is placed. On the right side, the reactions are written in terms on chemical symbols or molecular formulas. The product formulas are separated by a plus (+) symbol.
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Why is the enthalpy of formation of oxygen zero?
The enthalpy of formation of oxygen is zero because the enthalpy of formation any compound to form its elemental state is zero.
Here in this case, because oxygen is present in its elemental state it has zero enthalpy of formation because it does not require any energy to occur in a naturally occurring state.
Not only oxygen if any other compound is present in its naturally occurring state then it will have zero enthalpy of formation.
Because it does not require any amount of energy for any element to occur in its elemental state.
So, this is why we are concluding that because oxygen is present in its elemental state it has 0 enthalpy of formation.
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which of the following statements correctly describe bonding and intermolecular forces? select all that apply.
Intermolecular forces involve partial or small charges that are far apart and are relatively weak.
Bonding forces occur within the nucleus of the atom and are therefore strong
Covalent bonds are a type of intermolecular force since they are found in molecules.
Bonding forces are generally much stronger than intermolecular forces.
For a molecular substance, the strength of the intermolecular forces determines the physical properties of its phases.
Bonding forces are stronger than intermolecular forces, for molecular substance, strength of the intermolecular forces determines physical properties of phases, Intermolecular forces involve partial or small charges that are far apart and are relatively weak.
What can be said about the bonding and intermolecular forces?Intermolecular force is the force that mediates interaction between molecules including electromagnetic forces of attraction or repulsion which acts between atoms and neighboring particles (atoms or ions).
Bonding forces are the forces of attraction or repulsion which acts between neighboring particles like atoms, molecules or ions. Bonding force determines the elastic modulus (Young's modulus) of a material.
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aspirin (acetylsalicylic acid) has a pka of 3.5, a) calculate the ratio of ionized/un-ionized forms of the drug (i.e. [a-]/[ha]) in the stomach where ph is 1. calculate the ratio of ionized/un-ionized forms (i.e. [a-]/[ha]) in the intestine where ph is 6.
Each dissociation has a unique Ka and pKa value. When the moles of base added equals half the total moles of base are in equal amounts.
The ratio of CB / WA = 1 and according to the HH equation, pH = pKa + log(1) or pH = pKa.
What is mole?
Amount of matter is a measure of how many basic units of a particular matter are contained in an object or sample is called a mole.
Therefore, Each dissociation has a unique Ka and pKa value. When the moles of base added equals half the total moles of base are in equal amounts. Amount of matter is a measure of how many basic units of a particular matter are contained in an object or sample is called a mole.
The ratio of CB / WA = 1 and according to the HH equation, pH = pKa + log(1) or pH = pKa.
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to make pure barium sulfate, a precipitation reaction is used: aqueous solutions of barium nitrate and sodium sulfate are mixed and solid barium sulfate is separated from the reaction mixture by filtration. if a 1.0 l volumetric flask is used to prepare a 1.55 m barium nitrate solution, how many grams of barium sulfate (mm: 233.40 g/mol) will be produced if the entire solution is reacted with excess sodium sulfate?
Barium nitrate(BaNO3)+sodium sulfate(Na2SO4)---> Barium sulfate(BaSO4)+ sodium sulphate(Na2SO4).Thus 1 mole of Barium nitrate will yield one mole of Barium sulfate ;
Total Volume= 1L
Concentrarion in Molarity=1.55(M)
Now we know Molarity=Moles of Solute/Volume of solution in L
Therefore,no of moles=1.55 moles
Now,No of moles= grams of barium sulfate taken/Molecular Mass
MM=233.40g/mol(given
Thus,grams of barium sulphate taken=No o moles x MM =1.55 x 233.40=361.77 g,which is the required grams of barium sulfate.
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consider a di-glycine dipeptide (e.g. two glycine amino acids that have been covalently bonded together via a peptide bond). if the amino group and the c-terminal carboxy group are both protonated, which ph value do you expect is most consistent with these observations?
The pH of the solution is now obtained as 10 after deprotonation.
What is the correct pH value?We know that the pH has to do with the degree of the acidity or the alkalinity of system. Now we know that the pH can be measured by means of a pH meter.
In the body, there are a lot of biological molecules that work together to make the body to function effectively. Of all of these compounds, the most abundant of the biological molecules that are important in the body are the protein molecules.
The protein molecule is composed of the amino acids. Now we know that the amino acids can be protonated or deprotonated and the pH of the system would depend on whether the amino acid is protonated or deprotonated. The deprotonation of the substrate would make it much more basic.
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Missing parts;
Consider a di-glycine dipeptide (e.g. two glycine amino acids that have been covalently bonded together via a peptide bond). If the amino group is neutral and the C-terminal carboxy group is deprotonated, which pH value do you expect is most consistent with these observations?
Group of answer choices
a. 1
b. physiological pH
c. 3
d. the pKa of an aspartic acid side-chain carboxylate
e. 10
Which of the following statements correctly describe the viscosity of a liquid? Select all that apply.
- The viscosity of a given liquid decreases with increasing temperature.
- Viscosity is a liquid's resistance to flow.
- A liquid with stronger intermolecular forces will have a higher viscosity.
Statements that correctly describes the viscosity of a liquid : viscosity decreases with increasing temperature, viscosity is a resistance to flow and liquid with stronger intermolecular forces will have a higher viscosity.
What describes the viscosity?Viscosity describes the internal friction of moving fluid. Fluid with large viscosity resists motion because molecular makeup gives a lot of internal friction.
Things that determine the viscosity are: fluid temperature, flow conditions and pressure. Viscosity of fluid is a measure of resistance to deformation at a given rate.
Viscosity is determined by structural properties of the molecules and raising the temperature reduces viscosity of the solution or fluid.
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Determine whether each of the following amino acids is polar, nonpolar, positively charged _ or negatively charged at pH 7 Polar and neutral Nonpolar Positively charged Negatively charged glutamate arginine Leu Gln hydrophobic amino acids CH OOC CHz- COO NH; HyC CoO NH; NH,
The polar and neutral, non-polar, positively and negative charged amino acids are as follows -
Gln is polar.
C4H6O4N, aspartate, glutamate, is negatively charged, C9H7O3N, arginine, lysine, is positively charged,
hydrophobic amino acids, leucine and C3H7O2N are non polar amino acids.
Amino acids are the compounds having carboxyl and amino terminal at each end. They fold together to form secondary structures such as alpha helix, beta sheets and others. Upon more folding and turning they acquire three and four dimensional structure which imparts functional activity to the proteins.
Amino acids can be polar, non-polar, postively or negatively charged. The net ionic charge decides their postively or negatively charge. Also, aliphatic groups make the amino acids non-polar while presence of oxygen, sulphur, nitrogen gives polar character.
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The complete question is attached in figure.
a compound composed of 3.3% h, 19.3% c, and 77.4% o has a molar mass of approximately 60 g/mol. what is the molecular formula of the compound?
A substance with a molar mass of around 60 g/mol with a composition of 3.3% H, 19.3% C, having 77.4% O has the chemical formula CH2O3.
Give an example and describe the molecular formula.The molecular formula gives the amount of atoms of each element that make up one molecule of a material, giving the number of atoms of each element per molecule of a substance. It shows an accurate count of each atom within a molecule. Propane, for instance, has the chemical symbol C4H10. According to this formula, the offered chemical consists of 4 carbon atoms and 10 hydrogen atoms.
What is meant by the term "molecular formula"?The number of each object's atoms in a substance's molecules is determined by the molecular formula, which is also known as the "molecular formula." It shows an accurate count of each atom within a molecule. As an example
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at 1 atm pressure, the heat of sublimation of gallium is 277 kj/mol and the heat of vaporization is 271 kj/mol. to the correct number of significant figures, how much heat is required to melt 1.50 mol of gallium at 1 atm pressure? at 1 atm pressure, the heat of sublimation of gallium is 277 kj/mol and the heat of vaporization is 271 kj/mol. to the correct number of significant figures, how much heat is required to melt 1.50 mol of gallium at 1 atm pressure? 9 kj 60 kj 6 kj 268 kj 271 kj
The heat is required to melt 1.50 mol of gallium at 1 atm pressure is
The given data as follows :
Ga(s) --> Ga(g) ΔH = 277 kJ /mol
Ga(l) ----> Ga(g) ΔH = 271 kJ/mol
from the given two conditions we can simply subtract the heat of the sublimation to the heat of the vaporization, we get :
Ga(s) -----> Ga(l)
ΔH = heat of sublimation - heat of vaporization
ΔH = 277 kJ/mol - 271 kJ / mol
ΔH = 6 kJ/mol
The heat = nΔH
= 1.50 mol × 6 kJ/mol
= 9 kJ
Thus, at 1 atm pressure, the heat of sublimation of gallium is 277 kJ/mol and the heat of vaporization is 271 kJ/mol. heat is required to melt 1.50 mol of gallium at 1 atm pressure is 9 kJ.
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15. which of the following species would be the strongest lewis acid? a. k (aq) b. ca2 (aq) c. na (aq) d. mg2 (aq) e. al3 (aq)
[tex]Al^{3+}[/tex] is considered as strongest lewis acid among the following.
A stronger acid, in contrast to a stronger Lewis acid, has a reduced [tex]pK_{a}[/tex] value and a stronger propensity to take a pair of electrons, according to Bronsted and Lowry. Therefore, it is possible to think of the ionization potential, electron affinity, electronegativity, and electrophilicity as indicators of a Lewis acid's strength.
Lewis acids are thought to be entities that lack electrons. Lewis bases are regarded as electron-rich species. More positive charge means more electron shortage, which increases acidity.
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what is the net ionic equation when a solution of silver nitrate is mixed with a solution of sodium phosphate?
the net ionic equation when a solution of silver nitrate is mixed with a solution of sodium phosphate is silver nitrate(aq) + sodium phosphate(aq) → silver phosphate(s) + sodium nitrate(aq AgNO3(aq) + NagPO4(aq).
The net ionic equation is a synthetic calculation that only exhibits the components, substances, and ions that are involved directly in the chemical reaction. A net ionic formula illustrates only the chemical involved in a response, whereas a full ionic equation depicts the spectator ions as well. If there is no gross ionic equation to rebalancing, you encounter what is known as a molecular equation (or a complete molecular equation). These are more challenging to balance because the elements that are reduced and oxidised were also mixed in with substances that are not being lowered or oxidised.
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What is MOST likely the reason the author included information about what matter does in different temperatures?
Answer:to show you there different reactions
Explanation:
Consider the decomposition of ammonium chloride at a certain temperature NH4Cl (s) <=> NH3 (g) + HCl (g) Calculate the equilibrium constant Kp if the total pressure is 2.2 atm at that temperature.
Consider the decomposition of ammonium chloride at a certain temperature NH4Cl (s) <=> NH3 (g) + HCl (g). The equilibrium constant Kp is 4.4, if the total pressure is 2.2 atm at that temperature.
When a chemical process reaches equilibrium, the equilibrium constant (often represented by the letter K) sheds light on the interaction between the reactants and products. For instance, the ratio of the concentration of the products to the concentration of the reactants, each raised to their respective stoichiometric coefficients, can be used to establish the equilibrium constant of concentration (denoted by Kc) of a chemical reaction at equilibrium. It is significant to remember that there are several kinds of equilibrium constants that establish relationships between the reactants and products of equilibrium reactions in terms of various units. The ratio of reactant to product amounts that is used to predict chemical behavior is the definition of the equilibrium constant for a chemical process. In a state of equilibrium, the forward reaction rate equals the backward reaction rate. The rate constants are constant at a certain temperature. An equilibrium constant is the ratio of the forward reaction rate constant to the backward reaction rate constant, which must be a constant (Kequ).
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