Caculate the ΔG°rxn for the following reaction at 298 K ? How will the calculated ΔG°rxn change with an increase in temperature? Fe2O3 (s) + 3 H2(g) → Fe (s) + 3 H2O (l) Substance Fe2O3 (s) H2(g) Fe (s) H2O (l) ΔH°f (kJ/mol): -822.2 0 0 -285.8 S°(J/K • mol): 90.0 131.0 27.2 69.9
Caculate the ΔG°rxn for the following reaction at 298 K ? How will the calculated ΔG°rxn change with an increase in temperature? Fe2O3 (s) + 3 H2(g) → Fe (s) + 3 H2O (l) Substance Fe2O3 (s) H2(g) Fe (s) H2O (l) ΔH°f (kJ/mol): -822.2 0 0 -285.8 S°(J/K • mol): 90.0 131.0 27.2 69.9
Chemistry
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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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| Caculate the ΔG°rxn for the following reaction at 298 K ? How will the calculated ΔG°rxn change with an increase in temperature? |
| Fe2O3 (s) + 3 H2(g) → Fe (s) + 3 H2O (l) |
| Substance | Fe2O3 (s) | H2(g) | Fe (s) | H2O (l) |
| ΔH°f (kJ/mol): | -822.2 | 0 | 0 | -285.8 |
| S°(J/K • mol): | 90.0 | 131.0 | 27.2 | 69.9 |
Expert Solution
Step 1
since ΔG°rxn = ΔH°rxn - T ΔS°rxn
And ΔH°rxn = sum of (ΔH°f of products X reaction coefficient) - sum of (ΔH°f of reactants X reaction coefficient)
=> ΔH°rxn = ΔH°f (Fe(s)) + 3 X ΔH°f (H2O (l)) - [ ΔH°f (Fe2O3, (s)) + 3 X ΔH°f (H2, (g)) ]
And ΔS°rxn = sum of (S° of products X reaction coefficient) - sum of (S° of reactants X reaction coefficient)
=> ΔS°rxn = S° (Fe(s)) + 3 X S° (H2O (l)) - [ S° (Fe2O3, (s)) + 3 X S° (H2, (g)) ]
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