Consider the reaction CS2 (9) + 4H2 (9) = CH4 (9) + 2H2S(g) a. Calculate AH°, AS“ , and AG° at 25°C for this reaction. AĦ¡ (kJ/mol) S° (J/mol-K) CS2 (9) H2 (9) CH4 (9) H2S(9) 116.9 237.9 130.6 -74.87 186.1 -20.50 205.6 ΔΗ : kJ %3! AS J/K AG° kJ b. Assume AH° and AS° are constant with respect to a change of temperature. Now calculate AG° at 250°C. AG = kJ c. Compare the two values of AG". What can you say about the spontaneity of the reaction at 25°C and at 250°C? The reaction will be spontaneous at 25°C, and it will be nonspontaneous at 250°C. The reaction will be nonspontaneous at 25°C, and it will be spontaneous at 250°C. The reaction will be spontaneous at both 25°C and 250°C. The reaction will be nonspontaneous at both 25°C and 250°C.

Consider the reaction CS2 (9) + 4H2 (9) = CH4 (9) + 2H2S(g) a. Calculate AH°, AS“ , and AG° at 25°C for this reaction. AĦ¡ (kJ/mol) S° (J/mol-K) CS2 (9) H2 (9) CH4 (9) H2S(9) 116.9 237.9 130.6 -74.87 186.1 -20.50 205.6 ΔΗ : kJ %3! AS J/K AG° kJ b. Assume AH° and AS° are constant with respect to a change of temperature. Now calculate AG° at 250°C. AG = kJ c. Compare the two values of AG". What can you say about the spontaneity of the reaction at 25°C and at 250°C? The reaction will be spontaneous at 25°C, and it will be nonspontaneous at 250°C. The reaction will be nonspontaneous at 25°C, and it will be spontaneous at 250°C. The reaction will be spontaneous at both 25°C and 250°C. The reaction will be nonspontaneous at both 25°C and 250°C.

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

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Question

Consider the reaction
CS2 (9) + 4H2 (9) = CH4 (9) + 2H2S(g)
a. Calculate AH°, AS“ , and AG° at 25°C for this reaction.
AĦ¡ (kJ/mol) S° (J/mol-K)
CS2 (9)
H2 (9)
CH4 (9)
H2S(9)
116.9
237.9
130.6
-74.87
186.1
-20.50
205.6
ΔΗ :
kJ
%3!
AS
J/K
AG°
kJ
b. Assume AH° and AS° are constant with respect to a change of temperature. Now calculate AG° at 250°C.
AG =
kJ
c. Compare the two values of AG". What can you say about the spontaneity of the reaction at 25°C and at 250°C?
The reaction will be spontaneous at 25°C, and it will be nonspontaneous at 250°C.
The reaction will be nonspontaneous at 25°C, and it will be spontaneous at 250°C.
The reaction will be spontaneous at both 25°C and 250°C.
The reaction will be nonspontaneous at both 25°C and 250°C.

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