Question 16.6: At what temperature does DG8 become zero for the reaction co...

At what temperature does ΔG° become zero for the reaction considered in Example 16.5?

Fe_{2}O_{3}(s)  +  3H_{2}(g)  →  2Fe(s)  +  3H_{2}O(g)

ANALYSIS
equation for the reaction (Fe_{2}O_{3}(s)  +  3H_{2}(g)  →  2 Fe(s)  +  3H_{2}O(g))
ΔG° (0)
Information given:
from Example 16.5 (ΔH° and ΔS°) Information implied
T Asked for

STRATEGY

Substitute ΔH° and ΔS° values from Example 16.5 into the Gibbs-Helmholtz equation.

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ΔH° = 98.8 kJ; ΔS° = 0.1415 kJ/K ΔH°; ΔS°
ΔG° = ΔH° – TΔS°; 0 = 98.8  kJ – T(0.1415 kJ/K); T = \frac{98.8  kJ}{0.1415  kJ/K} = 698 K T

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