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...
Related questions
Question
Calculate the standard free-energy changes for the following reactions at 25°C.
CH4(g) + 2O2(g) → CO2(g) + 2H2O(l)
2MgO(s) → 2Mg(s) + O2(g)
Inorganic Substances |
|||
Substance |
ΔHo (kJ/mol) f |
ΔGo (kJ/mol) f |
So (J/K·mol) |
CO(g) |
-110.5 |
-137.3 |
197.9 |
CO2(g) |
-393.5 |
-394.4 |
213.6 |
H2(g) |
0 |
0 |
131.0 |
H2O(l) |
-285.8 |
-237.2 |
69.9 |
O2(g) |
0 |
0 |
205.0 |
Organic Substances |
|||
CH4(g) |
-74.85 |
-50.8 |
186.2 |
Mg(s) |
0 |
0 |
32.5 |
MgO(s) |
-601.8 |
569.6 |
26.78 |
Table 1. Selected
*The ΔHof, ΔGof and S° values for ions are based on the reference states ΔHof (H+) = 0, ΔGof (H+) = 0, and S°(H+) = 0.
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