Answered: For a certain reaction, ΔG° = 87…

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter17: Spontaneity, Entropy, And Free Energy

Section: Chapter Questions

Problem 118CP: Consider the reaction H2(g)+Br2(g)2HBr(g) where H = 103.8 kJ/mol. In a particular experiment, equal...

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Question

For a certain reaction, ΔG° = 87 kJ/mol, ΔH° = 100 kJ/mol at STP. At what temperature, in K, is the reaction at equilibrium, assuming that ΔS° and ΔH° are temperature-independent?

Round the answer to two significant digits.

Group of answer choices

1,700 K

1,900 K

2,100 K

2,300 K

None of the above

Expert Solution

Step 1

$A t, S T P t e m p e r a t u r e, T = 273 K W e k n o w t h a t, ∆ G ° = ∆ H ° - T ∆ S ° G i v e n t h a t, ∆ G ° = 87 K J / m o l ∆ H ° = 100 K J / m o l T = 273 K P u t t i n g t h e s e v a l u e s i n a b o v e e q u a t i o n - 87 = 100 - 273 \times ∆ S ° \Rightarrow ∆ S ° = 0.0476 K J / m o l . K \Rightarrow ∆ S ° = 47.6 J / m o l K$

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