Calculate ΔG∘rxn again at 25∘C, but use the equation ΔG∘rxn=ΔH∘rxn−TΔS∘rxn to determine the value. 2. Use your results to calculate ΔG∘rxn at 500.0 K. Express the free energy to four significant figures and include the appropriate units.

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Chapter1: Chemical Foundations
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1. Calculate ΔG∘rxn again at 25∘C, but use the equation ΔG∘rxn=ΔH∘rxn−TΔS∘rxn to determine the value.

2. Use your results to calculate ΔG∘rxn at 500.0 K. Express the free energy to four significant figures and include the appropriate units.

Consider the following reaction:
2CO(g) + 2NO(g) → 2CO2(g) + N2(g)
When the standard AG: values are used to calculate the value of
AGixn at 25°C, we get -689.6 kJ .
Standard thermodynamic quantities for selected substances at 25
°C
Substance AH (kJ/mol) |AG; (kJ/mol) | S° (J/(mol · K))
O2 (g)
O3 (g)
205.2
142.7
163.2
238.9
CO(g)
- 110.5
- 137.2
197.7
-
CO2(g)
- 393.5
- 394.4
213.8
N2(g)
191.6
NO(g)
91.3
87.6
210.8
NO2(g)
33.2
51.3
240.1
Transcribed Image Text:Consider the following reaction: 2CO(g) + 2NO(g) → 2CO2(g) + N2(g) When the standard AG: values are used to calculate the value of AGixn at 25°C, we get -689.6 kJ . Standard thermodynamic quantities for selected substances at 25 °C Substance AH (kJ/mol) |AG; (kJ/mol) | S° (J/(mol · K)) O2 (g) O3 (g) 205.2 142.7 163.2 238.9 CO(g) - 110.5 - 137.2 197.7 - CO2(g) - 393.5 - 394.4 213.8 N2(g) 191.6 NO(g) 91.3 87.6 210.8 NO2(g) 33.2 51.3 240.1
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