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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