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Elza [17]
3 years ago
8

All of the following contribute to the large, negative, free-energy change upon hydrolysis of "high-energy" compounds except: a.

stabilization of products by extra resonance forms b. stabilization of products by ionization c. low activation energy of the forward reaction d. electrostatic repulsion in the reactant
Chemistry
1 answer:
klasskru [66]3 years ago
8 0

Answer:

C) low activation energy of forward reaction

Explanation:

Activation energy for the forward reaction is the quantity of free energy which is needed for a reaction to move from the reactant phase of energy level to the transition state of energy level. The higher the rate of energy level, the slower the chemical reaction.

Activation energy is a barrier that must be overcome for a reaction to take place.

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How many grams of dry nh4cl need to be added to 2.50 l of a 0.800 m solution of ammonia, nh3, to prepare a buffer solution that
tia_tia [17]

Answer:

The correct answer is 574.59 grams.

Explanation:

Based on the given information, the number of moles of NH₃ will be,  

= 2.50 L × 0.800 mol/L

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pH + pOH = 14.00

pOH = 14.00 - pH

pOH = 14.00 - 8.53

pOH = 5.47

The Kb of ammonia given is 1.8 * 10^-5. Now pKb = -logKb,  

= -log (1.8 ×10⁻⁵)

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= 4.74

Based on Henderson equation:  

pOH = pKb + log ([salt]/[base])

pOH = pKb + [NH₄⁺]/[NH₃]

5.47 = 4.74 + log ([NH₄⁺]/[NH₃])

log([NH₄⁺]/[NH₃]) = 5.47-4.74 = 0.73

[NH₄⁺]/[NH₃] = 10^0.73= 5.37

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mass of NH₄Cl = 10.74 mol × 53.5 g/mol

= 574.59 grams.  

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