Question
Asked Dec 24, 2019
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a. Which value corresponds to a negative value of ?G°: Keq = 10-2 or Keq = 102?
b. In a unimolecular reaction with ve times as much starting material as product at equilibrium, what is the value of Keq? Is ?G° positive or negative?
c. Which value corresponds to a larger Keq: ?G° = -8 kJ/mol or ?G° = 20 kJ/mol?

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Expert Answer

Step 1

a. Greater the equilibrium constant value the concentration of product formation is high.  An equilibrium reaction that favours product formation has negative standard gibbs free energy.  Therefore, Keq = 102 corresponds to negative standard Gibbs free energy.

Step 2
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Atequlibrium.[A] = 5×[B] K = [B]/[A] = 1/5 =0.2 AG° =-RTINK. req = -8.314*298*ln(0.2) = 3987.5 J/mole = -3.9875 kJ/mole

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