Question

For the reaction C(s) + H2O(g) CO(g) + H2(g) H° = 133.3 kJ/mol and S° =...

For the reaction C(s) + H2O(g) CO(g) + H2(g) H° = 133.3 kJ/mol and S° = 121.6 J/K mol at 298 K. At temperatures greater than ________ °C this reaction is spontaneous under standard conditions.

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Answer #1

G = H-TS

for spontaneous reactions G = 0

0 = H-TS

0 = 133.3 -T * 0.1216

133.3 = T*0.1216

T = 133.3/0.1216 = 1096.2K

823.2C0 greater than the this temperature

for spontaneous reactions G<0

H-TS <0

TS> H

T > H/S

> 133.3/0.1216

> 1096.2K

T > 823.2C0

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