The pH of a buffer solution containing acid of pKa 7.5 will be 8.1.
The pH of a solution indicates its acidity or basicity. A pH below 7 is acidic, while pH above 7 is basic. 7 is considered as the neutral value.
A buffer is a solution that has the ability to resist the change in pH when an acid or a base is added to it. The natural example of buffer is blood.
According to the question, pKa of acid = 7.5
If concentration of base is x then, concentration of acid will be x/4.
According to the Henderson–Hasselbalch equation,
pH = pKa + log [A⁻] / [HA]
pH = 7.5 + log [[tex]\frac{x}{x/4}[/tex]]
pH = 7.5 + log 4 ⇒ 7.5 + 0.602
pH = 8.1
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A solution is prepared by dissolving 117 grams of salt (NaCl) in 250 milliliters of water (H₂O). What is
the molarity of the solution?
A. 0.47 M NaCl
B. 8.0 x 10-3 M NaCl
C. 8.0 M NaCl
D. 468 M NaCl
Taking into account the definition of molarity, the molarity of the solution is 8 M.
Definition of molarityMolar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.
The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:
[tex]Molarity=\frac{number of moles}{volume}[/tex]
Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].
Molarity of the solution in this caseIn this case, you know:
number of moles= 117 grams×[tex]\frac{1 mole}{58.45 grams}[/tex]= 2 moles, where 58.45 [tex]\frac{grams}{mole}[/tex] is the molar mass of NaClvolume= 250 mL= 0.250 L (being 1000 mL= 1 L)Replacing in the definition of molarity:
[tex]Molarity=\frac{2 moles}{0.250 L}[/tex]
Solving:
Molarity= 8 [tex]\frac{moles}{liter}[/tex]= 8 M
Finally, the molarity of the solution is 8 M.
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When bsia is assembled as an octamer, what is most likely to be true regarding l76, l77, and l79?
The option that is most likely to be true regarding L76, L77, and L79 is that option B: The assembly would incur an entropic penalty if they occupied a solvent-exposed site.
What is entropic penalty?The entropic penalty in regards to ordered water is known to be one that tells or account for any form of weaker binding of the antibiotic novobiocin to what we call resistant mutant of DNA gyrase.
Note that in regards to the scenario above, the Entropic penalty is seen as the thermodynamically disfavored needs that is required in forming a cage of polar solvent molecules that is known to be seen around surface that has exposed hydrophobic potion of a molecule.
Hence, The option that is most likely to be true regarding L76, L77, and L79 is that option B: The assembly would incur an entropic penalty if they occupied a solvent-exposed site.
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See full question below
When Bs1A is assembled as an octamer, what is most likely to be true regarding L76, L77, and L79?
A. They are oriented toward the solvent-exposed exterior of the protein assembly.
B. The assembly would incur an entropic penalty if they occupied a solvent-exposed site.
C. Unlike in a monomer, they are not situated within the hydrophobic cap.
D. Their physiochemical properties are not substantially dependent on their hydrophobicity
What is the maximum vertical distance between the line y = x 2 and the parabola y = x2 for −1 ≤ x ≤ 2?
x2=x+2 at x=−1 and x=2 so we have no need to worry about the end-points
f(x)=x+2−x^2
df/dx=1–2x
and that is zero (indicating a maximum) at x=1/2
So the maximum distance is f(1/2)=2.5–0.25=2.25
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Liquid 1 reacts with liquid 2, producing a solid and a gas. using this scenario, which supports the law of conservation of mass? mass of liquid 1 mass of solid = mass of liquid 2 mass of gas mass of liquid 1 – mass of solid = mass of liquid 2 – mass of gas mass of liquid 1 – mass of liquid 2 = mass of solid mass of gas mass of liquid 1 mass of liquid 2 = mass of solid mass of gas
mass of Liquid 1 + mass of solid = mass of Liquid 2 + mass of gas mass of Liquid
The law of conservation of mass or principle of mass conservation states that for any system closed to all transfers of matter and energy, the mass of the system must remain constant over time, as system's mass cannot change, so quantity cannot be added nor removed. Hence, the quantity of mass is conserved over time.
What is Law of conservation of mass ?According to the rule of conservation of mass, mass is neither generated nor destroyed during a chemical process. For instance, when coal is burned, the carbon atom in it transforms into carbon dioxide. The carbon atom transforms from a solid to a gas, yet its mass remains constant.
The understanding that substances do not actually vanish as a result of a reaction, despite what might appear to be the case, but rather change into another material of equal mass, was made possible by the law of conservation of mass, which was essential to the development of chemistry.Learn more about Law of conservation of mass here:
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How much heat is gained by cu when 51. 8 g of cu is warmed from 15. 5°c to 76. 4°c? the specific heat of cu is 0. 385 j/(g · °c). show the set up and answer with unit
The heat is gained by Cu when 51. 8 g of Cu is warmed from 15. 5°c to 76. 4°c If the specific heat of Cu is 0. 385 j/(g · °c) is 999.42 J.
What is specific heat?Specific heat is defined as the heat which is required to raise the temperature by 1°C of the unit mass of a given substance by a given amount.
We are required to calculate the quantity of heat energy gained by Cu
As we know that,
Q = m × c ×∆T
where,
Q is the quantity of heat energy
m is mass of substance = 0.051kg
c is specific heat of substance = 385J/kg.°C
∆T is change in temperature = 50.9
By substituting all these value we will get,
Q = 0.051 × 385 × 50.9
Q = 999.42J
Thus, we calculated that the quantity of heat gained by 0.051kg of Cu is 999.42J.
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How many moles of calcium chloride would react with 5. 99 moles of aluminum oxide?
There are 17.97 moles of calcium chloride would react with 5. 99 moles of aluminum oxide .
The balanced chemical equation between reaction between calcium chloride and aluminum oxide is given as,
[tex]3CaCl_{2} (aq)+Al_{2} O_{3} (s)[/tex] → [tex]3CaO_{2} (s)+2Al Cl_{3} (aq)[/tex]
The molar ratio of above reaction is 3:1
It means 3 moles of calcium chloride is require to react one mole of aluminum oxide.
The number of moles of calcium chloride requires to react with 5. 99 moles of aluminum oxide = 3 × 5. 99 = 17.97 moles
The equation in which number of atoms of elements in reactant side is equal to the number of atoms of elements in product side is called balanced chemical equation .
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Please answer this question for grade 9
To convert oxygen gas to solid, we need to continuous withdrawal of heat from the gas by cooling.
What makes up matter?Matter is composed of particles and these particles that compose matter are always in constant motion. This is the main thrust of the so called Kinetic Theory of Matter.
Now we know that the particles that compose a solid are held in a fixed position thus they spread out or expand when heated. The particles of a liquid tend not to be held in fixed positions thus they can be poured.
Given that oxygen has a boiling point of -219°C and a freezing point of -183°C, it follows that at 0°C is a gas and at -200°C, oxygen is a liquid.
To convert oxygen gas to solid, we need to continuous withdrawal of heat from the gas by cooling.
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Helium and methane gases are mixed together in a container. what is the ratio of their root-mean-square speeds, i. e. (vrms,helium) / (vrms,methane) ?
Root mean square speed is the estimation of the effect of temperature and weight on kinetic energy. The root means square speed for a mixture of helium and methane is 2. Thus, option d is correct.
What is the root mean square speed?Root mean square speed is the estimation of the square root of the mean value of the squared speeds of the individual gas particles in the mixture.
As it is known that,
Root mean square speed = √{3RT/M}
Where T is constant temperature and R is gas constant. The molecular mass of helium gas is 4 g/mol and of methane is 16 g/mol.
Vrms = √{3RT/M}
For helium, Vrms = √{3RT/4}
And, for methane = Vrms = √{3RT/16}
So, (Vrms,helium) / (Vrms,methane) = 4 / 2 = 2
Therefore, option d. 2 is the root-mean-square speed for the mixture.
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Your question is incomplete, but most probably your full question was, Helium and methane gases are mixed together in a container. what is the ratio of their root-mean-square speeds, i. e. (Vrms, helium) / (Vrms, methane)?
1/2102cannot tell41/4If a parcel of air has a temperature of -1. 1c, what is saturation mixing ratio for this parcel?
The saturation mixing ratio for this parcel is 3.5
Saturation mixing ratio:
The value of the mixing ratio of saturated air at the specified temperature and pressure; a thermodynamic function of the state.
A thermodynamic diagram can be used to directly read this value. The saturation mixing ratio speaks of saturation in relation to a plane surface of pure water without any other qualifier. Additionally, saturation mixing ratios can be defined in relation to a flat ice surface.
The mass of water vapor to the mass of dry air (Md) in a parcel of air at saturation is known as the saturation mixing ratio. In other words, the saturation mixing ratio is the most water vapor a package can contain without condensing. The saturation mixing ratio on the Skew-T is represented by the mixing ratio line that passes through the temperature.
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The hydrolysis of esters in base is called ________. a. the hunsdiecker reaction b. transesterification c. saponification d. the dieckmann condensation
The hydrolysis of esters in base is called saponification .
So, option C is correct one.
The saponification is the process that involves conversion of fats , oils , lipids into soap and water in the presence of alkaline medium. Saponification is the process of making soap.
During the saponification process, the mixture has an acidity, which tells that it's not safe for usage. After the saponification process is complete, the pH should be a base.The process of formation of carboxylic salt and water by hydrolysis of ester in base is called saponification.
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Potassium reacts with oxygen gas to produce potassium oxide. Determine the percent yield for the reaction between 8.92 grams of potassium and 3.28 grams of oxygen gas if 6.36 grams of potassium oxide are produced?
Answer:
Percent Yield K₂O = 59.2%
Explanation:
Before you can calculate the percent yield, you need to find the theoretical yield. This value is the amount of product produced using the balanced chemical equation and molar masses. However, the question does not specify which reactant is the limiting reagent. Therefore, you have to calculate the mass of the product starting from both values.
To find the theoretical yield, you need to (1) convert grams K/O₂ to moles K/O₂ (via molar masses), then (2) convert moles K/O₂ to moles K₂O (via mole-to-mole ratio from balanced equation coefficients), and then (3) convert moles K₂O to grams K₂O (via molar mass). It is important to arrange the conversions in a way that allows for the cancellation of units. The final answer should have 3 sig figs to match the sig figs of the given values.
Molar Mass (K): 39.098 g/mol
Molar Mass (O₂): 2(15.998 g/mol)
Molar Mass (O₂): 31.996 g/mol
Molar Mass (K₂O): 2(39.098 g/mol) + 15.998 g/mol
Molar Mass (K₂O): 94.194 g/mol
The balanced equation:
4 K + O₂ -----> 2 K₂O
8.92 g K 1 mole 2 moles K₂O 94.194 g
-------------- x ----------------- x -------------------- x ---------------- = 10.7 g K₂O
39.098 g 4 moles K 1 mole
3.28 g O₂ 1 mole 2 moles K₂O 94.194 g
---------------- x --------------- x --------------------- x -------------- = 19.3 g K₂O
31.996 g 1 mole O₂ 1 mole
Because potassium produces the smaller amount of product, it is the limiting reagent. This means that all the potassium reactant is used up before the oxygen gas runs out. So, the theoretical yield of potassium oxide is 10.7 grams.
Now, you can use the theoretical yield and actual yield to determine the percent yield.
Actual Yield
Percent Yield = ------------------------------ x 100%
Theoretical Yield
6.36 g K₂O
Percent Yield = ------------------------ x 100%
10.7 g K₂O
Percent Yield = 59.2%
Be sure to answer all parts. an aqueous solution of a strong base has a ph of 10. 220 at 25°c. calculate the concentration of the base if the base is (a) lioh: × 10 m (b) ba(oh)2: × 10 m
An aqueous solution of a strong base has a pH of 10. 220 at 25°C then concentration of the base if the base is
(a) LiOH = 1.66×[tex]10^{-4}[/tex] M
(b) [tex]Ba(OH)_{2[/tex] = 3.32×[tex]10^{-4}[/tex]M
Calculation ,
For calculation of concentration of the LiOH and [tex]Ba(OH)_{2[/tex] first we have to calculate pOH of the solution.
pH + pOH = 14
pOH = 14 - pOH = 14 - 10.22 = 3.78
pOH = -㏒ [ [tex]OH^{-}[/tex] ]
[ [tex]OH^{-}[/tex] ] = [tex]10^{-pH}[/tex] = [tex]10^{-3.78}[/tex] = 1.66×[tex]10^{-4}[/tex]
So , concentration of the base LiOH = 1.66×[tex]10^{-4}[/tex]
So , concentration of the base [tex]Ba(OH)_{2[/tex] = 1.66×[tex]10^{-4}[/tex] ×2 = 3.32×[tex]10^{-4}[/tex]
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Aside from the high-energy molecules like atp and nadh, what is the net reaction for the complete oxidation of acetyl-coa in the tca cycle?
Aside from the high-energy molecules like ATP and NaDH . The net reaction for the complete oxidation of acetyl-COA in the TCA cycle is given as ,
Pyruvate → 3[tex]CO_{2}[/tex]
The reaction of the cycle are carried out by eight enzymes that completely oxidize acetate ( a two carbon molecule ) , in the form of acetyl-COA , into two molecules each of carbon dioxide and water . The net yield of one turn of the TCA cycle in terms of energy - containing compounds is one GTP , one FADH2 , and three NADH molecules . The NADH molecules are used in oxidative
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What process permanently rearranges the basic structure of curly hair into a straight or smoother form?
Chemical hair relaxing is the process that permanently rearranges the basic structure of curly hair into a straight or smoother form.
Chemical relaxers disrupt disulfide bonds by using chemicals and extremely high heat.
The procedure of permanently altering the fundamental structure of excessively curly hair into a straight shape is known as chemical hair relaxing.
Professionally performed, it leaves the hair straight and in good enough condition to be styled into practically any shape.
Sodium hydroxide, which does not require pre-shampooing, and ammonium thioglycolate, which may require pre-shampooing, are the two main categories of hair relaxers.
Processing, neutralizing, and conditioning are the three fundamental phases in all chemical hair relaxing procedures.
Hence, Chemical hair relaxing is the process that permanently rearranges the basic structure of curly hair into a straight or smoother form.
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Certain drugs, such as ssris, block the reuptake of a neurotransmitter into the presynaptic cell. what effect does this have onsynaptic communication?
Selective serotonin reuptake inhibitors (SSRIs) are drugs that are antidepressants. These blocks the reuptake of a neurotransmitter leading to increases in their activity in the synaptic cells.
What are neurotransmitters?Neurotransmitters are defined as the signaling molecules that are secreted by the nerve cells and act as signal transporter between the neurons and the other cells of the body.
The SSRIs class of drugs affects this neurotransmitter and blocks the pathway to the presynaptic cell. This, in turn, affects synaptic communication by increasing the amount of those SSRIs in the body and acting as a stimulant to treat various diseases.
Therefore, the SSRIs block the neurotransmitter and result in their effects.
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When pcl5 solidifies it forms pcl4 cations and pcl6–anions. according to valence bond theory, what hybrid orbitals are used by phosphorus in the pcl4 cations?
When pcl5 solidifies it forms pcl4 cations and pcl6–anions. according to valence bond theory, hybrid orbitals that are used by phosphorus in the pcl4 cations are one orbital of s and three orbital of p as it is sp³hydridised.
What is sp³ hybridization?Hybridization is a process or system which specifies the shape and geometry of any element or molecule with bond angles too.
The pcl4 cation is sp³ hybridized because of the phosphorus behave as a central atom here and the 4 chloride molecules are attached with the p- orbitals to the phosphorus molecule.
Therefore, pcl4 cation is sp³ hybridized.
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A mixture of three gases containing an equal number of moles of each gas has a total pressure of 12. 0 atm. What is the partial pressure of each gas?
A mixture of three gases containing an equal number of moles of each gas has a total pressure of 12. 0 atm then partial pressure of each gas is 4 atm .
Calculation ,
According to Dalton law the total gas of the container is equal to the sum of partial pressure of each gas .
[tex]P_{t}[/tex] = [tex]P_{1}[/tex] +[tex]P_{2}[/tex]+ [tex]P_{3}[/tex]
Partial pressure = total pressure × mole fraction
mole of each gas is equal . So, mole fraction is also equal for each gas.
Let the number of mole = x
mole fraction = x/3x =1/3
[tex]P_{1}[/tex] = 12. 0 atm/3 = 4 atm
[tex]P_{2}[/tex] = 12. 0 atm/3 = 4 atm
[tex]P_{3}[/tex] = 12. 0 atm/3 = 4 atm
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Anil accidentally swallows a substance that activates the complement cascade in the absence of bound antibodies. this substance would:_______
Answer:
This substance would cause cause an extensive cellular damage to Anil.
How many hydrogen bonds exist between this DNA strand and its complementary strand?
5'-TCCGGAG-3'
Answer:
19 hydrogen bonds
Explanation:
Between every thymine and adenine, there are 2 hydrogen bonds.
Between every guanine and cytosine, there are 3 hydrogen bonds.
Since there are 2 total thymines and adenines, they contribute 4 hydrogen bonds overall.
-----> 2 H bonds x 2 nucleotides = 4 H bonds
Since there are 5 total cytosines and guanines, they contribute 15 hydrogen bonds overall.
-----> 3 H bonds x 5 nucleotides = 15 H bonds
Therefore, there are 19 hydrogen bonds between the complementary strands.
Part 1. determine the molar mass of a 0.314-gram sample of gas having a volume of 1.6 l at 287 k and 0.92 atm. show your work.
part 2. describe the temperature and pressure conditions at which the gas behaves like an ideal gas.
The molar mass of a substance can be calculated by dividing the mass of the substance by its number of moles.
However, the number of moles can be calculated using the following formula:
PV = nRT
Where;
P = pressureV = volumeR = gas law constantT = temperaturen = no of moles0.92 × 1.6 = n × 0.0821 × 287
1.47 = 23.56n
n = 1.47/23.56
n = 0.624moles
Molar mass = 0.314g ÷ 0.624mol
Molar mass = 0.503g/mol
Therefore, the molar mass of a 0.314-gram sample of gas having a volume of 1.6L at 287K and 0.92 atm is 0.503g/mol.
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In the lewis structure of HCN. How many nonbonded (lone) electron pairs are present?
In lewis structure of HCN, we can observe one lone pair of electron.
The 7 protons in the nitrogen nucleus are balanced by the 3 electrons from the triple bond, the 2 electrons from its lone pair, and the 2 inner core electrons that make up the nitrogen nucleus. As a result, nitrogen is formally neutral.What is meant by lewis structure?The valence shell electrons in a molecule are depicted in an extremely simplified manner by a Lewis Structure. It is used to demonstrate how the electrons in a molecule are positioned around particular atoms. Electrons are shown as "dots" or, in the case of a bond, as a line connecting the two atoms.How should a Lewis structure be written?Step 1: Finding the total amount of valence electrons.Step 2: Outline the molecule's skeletal structure. Step 3: Form each bond in the skeletal structure using two valence electrons. Step 4: Try to distribute the leftover valence electrons as nonbonding electrons in order to fill the atoms' octets.To learn more about lewis structure visit:
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Nacl has a delta.hfus = 30.2 kj/mol. what is the mass of a sample of nacl that needs 732.6 kj of heat to melt completely? use q equals n delta h.. 24.3 g 82.7 g 1,407.1 g 1,417.7 g
The correct value is 1417.7 grams.
The mass of a sample of Nacl that needs 732.6 kj of heat to melt completely is 1417.7 grams.
What is Enthalpy of fusion?Enthalpy of fusion is the quantity of heat energy needed to turn a unit mass of the a solid now at melting point into such a liquids without raising the temperature.
Some key point for enthalpy of fusion of melting ice are-
The quantity of heat energy required to convert solid stuff into liquid is known as the heat of fusion (melting.)Q = mHf is the formula for calculating heat of fusion.The temperature is not a part of the equation or the computation because matter does not truly change temperature when it changes states.The fusion heat is usually a positive value, with the exception of when melting heliumCalculation for the heat required-
Nacl has a delta.hfus = 30.2 kj/mol => [tex]\Delta H_{\text {fusion }}=30.2 \mathrm{~kJ} / \mathrm{mol}[/tex]
As a result, the enthalpy of fusion for 1 mole of sample NaCl is 30.2 kJ.
Additionally, the mass of 1 mole for NaCl is 58.44 grams.
For a quantity of 58.44 grams of NaCl, 30.2 kJ of heat are required.
Consequently, 732.6 kJ heat will be required for;
[tex]\frac{58.44 g}{30.2 k J} \times 732.6 k J=1417.65 \approx 1417.7[/tex] grams of NaCl.
Therefore, the mass of a sample of Nacl that needs 732.6 kj of heat to melt completely is 1417.7 grams of NaCl.
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Aspirin is the common name for acetyl salicylic acid, C9H8O4. One tablet contains 0. 325 g of aspirin. How many moles of aspirin is this?
Answer:
.0017952905 mol
Explanation:
I hope this helps, I can't promise I got it right, please let me know haha!
Why is it important to know if a substance is a molecular compound or an ionic compound before predicting its effect on the boiling and freezing points of a solvent?
It is important to know if a substance is a molecular compound or an ionic compound because the boiling and freezing points of a solvent are colligative properties, and they depend on the solute particles.
What are molecular and ionic compounds?Molecular compounds are pure things called that are created when atoms are joined by the sharing of electrons. Ionic compounds are formed by transferring electrons between the elements.
It is important to know the type of compounds before predicting because the more the solute particles the more the freezing point and lower the boiling points. And it tells how much amount f solute will be fine in the solvent.
Thus, knowing if a material is a molecular or ionic compound is crucial since a solvent's boiling and freezing temperatures are collaborative features that are dependent on the solute particles.
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Decide whether each proposed multiplication or division of measurements is possible. If it is possible, write the result in the last column of the table.
The possible options for the proposed multiplication or division of measurements are:
1. 9.0 km * 7.0 km = 63 km²; this is a correct option because km² is dimensionally correct.
3. 24 dL²/0.60 L = 0.24 L²/0.60 L = 0.4 L is a correct option since L is a unit of volume.
What are the possible options among the proposed multiplication or division of measurements?The possible options among the proposed multiplication or division of measurements are those which are dimensionally correct.
Considering the given options:
1. 9.0 km * 7.0 km = 63 km²
This is a correct option because km² is dimensionally correct as it is a unit of area.
2. 2.0 g² * 0.043 kg is not correct since there is no unit of square mass.
3. 24 dL²/0.60 L = 0.24 L²/0.60 L = 0.4 L is a correct option since L is a unit of volume.
In conclusion, the correct measurements options are those that are dimensionally correct.
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Which of these molecules have all atoms lying in the same plane? a. cbr4 and nh3 b. pf5 c. nh3 and hcn d. so3 and hcn
Molecules having all atoms lying in the same plane is c) HCN
HCN is a molecule in which all the atoms in the same plane i.e. it is a Planar molecule.
A Planar molecule is the one in which atoms are arranged in same plane i.e. atoms arrange themselves to exist in a two dimensional plane around the central atom.
The presence of double bond or triple bond in a molecule allows the molecule to get arranged in a plane.
The presence of triple bond in HCN allows it to be arranged in a plane.
HCN to be specific is a Linear molecule in which the angle between H and CN is 180.
The bond between C and N atom is a triple bond containing two pie bonds and one sigma bond.
Hence c) HCN is a planar molecule.
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Benzene is often produced as a side product during grignard reactions using phenylmagnesium bromide. how can its formation be explained? give a balanced equation for its formation
Benzene is produced as a side product when water react with phenyl magnesium bromide during Grignard reactions.
What is Grignard Reaction ?The Grignard reaction involves an R-Mg-X, a carbon chain bound to a magnesium halide, used to form alcohols by attacking carbonyls such as in aldehydes or ketones.
Here R act as a nucleophile and Mg-X act as a electrophile. Instead of attacking carbonyl, which is present in the reaction, the benzene ring will attack water molecules present around, grabbing a H⁺ and pushing away MgBr .
The required reaction is :
PhMgBr + H₂O → Ph-H + MgBrOH
Thus from the above conclusion we can say that it is always advised to use dry Grignard to avoid this reaction.
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I NEED HELP FOR THIS QUESTION ASAP
Explanation:
I've been having this problem, the pins you guys give on your question don't really load for me?The penny coin was removed from circulation in Canada
In February of 2014. The United States may soon do the
same. The major reason for this move was the rising value
of copper metal. When copper’s value increased, pennies
were produced as a zinc slug with a thin layer of copper
plated over top. Zinc reacts readily with hydrochloric acid,
while copper does not. A triangular file is used to nick the
edge of a penny to expose the zinc slug below the layer
of copper. The zinc reacts with the acid releasing bubbles
from the nicked area until nothing remains but a thin shell
of copper. If 0.948 L of hydrogen gas is collected over water
at 20.0°C and a total pressure of 752 mm Hg, determine the
percentage by mass of the copper in the 2.586 g penny.
As a result, the dry gas volume at STP is 45.58 cm 3.
Water vapor is present in the gas. Since H2 is created during the reaction and water vapor is irrelevant when determining the equivalent weight, we only need the dry gas. As a result, the volume of H2 gas can be calculated using the ideal gas law.
P 1 = 750 mm Hg, 14 mm Hg, 736 mm Hg V = 50 cm 3 T = 17 0 C = 290 K
P = 760mmHg, V =?cm3, T = 0 0 and C = 273K.
The Gas equation follows.
P 1V 1/ T1 = P 2V 2/ T2
290/73650 = 273/760V 2
= 290760V 2
= 7365027V 2 = 45.58 cm
As a result, the dry gas volume at STP is 45.58 cm 3.
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During transpeptidation, nucleophilic attack occurs between the α-amine group in the ____ site and the esterified carbon in the ____ site.
During transpeptidation, nucleophilic attack occurs between the α-amine group in the A site and the esterified carbon in the P site
What is transpeptidation ?A chemical process in which an amino acid residue or peptide residue is transferred from one amino compound to another. This process occurs when a protease reversibly converts one peptide to another.
a process where one or more amino acids are transferred from one peptide chain to another, as in the case of a transpeptidase activity, or where a peptide chain itself is produced, as in the case of the production of a bacterial cell wall.Peptidoglycan glyco-syltransferases create the glycan strands (PGTs). The most popular class of antibiotics' fatal targets are enzymes termed transpeptidases (TPs), which produce the peptide crosslinks: using beta-lactamsLearn more about Transpeptidation reaction here:
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