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18. Use Hess's law to calculate AG°rxn using the following information. CO(g) → C(s) + 1/2 02(g) AGᵒrxn = ? AGᵒrxn=+394.4 kJ CO2(g) → C(s) + O2(g) CO(g) + 1/2 02(g) → CO2(g) A) -60.0 kJ B) +651.6 kJ C) -265.8 kJ D) +137.2 kJ E) +523.0 kJ AGᵒrxn=-257.2 kJ

18. Use Hess's law to calculate AG°rxn using the following information. CO(g) → C(s) + 1/2 02(g) AGᵒrxn = ? AGᵒrxn=+394.4 kJ CO2(g) → C(s) + O2(g) CO(g) + 1/2 02(g) → CO2(g) A) -60.0 kJ B) +651.6 kJ C) -265.8 kJ D) +137.2 kJ E) +523.0 kJ AGᵒrxn=-257.2 kJ

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
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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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18. Use Hess's law to calculate AG°rxn using the following information. AGᵒrxn = ? CO(g) → C(s) + 1/2 02(g) CO2(g) → C(s) + O2(g) AGᵒrxn +394.4 kJ CO(g) + 1/2 02(g) → CO2(g) A) -60.0 kJ B) +651.6 kJ C) -265.8 kJ D) +137.2 kJ E) +523.0 kJ AG'rxn=-257.2 kJ 19. For a given reaction, AH = +35.5 kJ/mol and AS = +83.6 J/Kmol. The reaction is Assume that AH and AS do not vary with temperature. spontaneous A) at T < 425 K B) at T > 425 K C) at all temperatures D) at T > 298 K E) at T < 298 K
Transcribed Image Text:18. Use Hess's law to calculate AG°rxn using the following information. AGᵒrxn = ? CO(g) → C(s) + 1/2 02(g) CO2(g) → C(s) + O2(g) AGᵒrxn +394.4 kJ CO(g) + 1/2 02(g) → CO2(g) A) -60.0 kJ B) +651.6 kJ C) -265.8 kJ D) +137.2 kJ E) +523.0 kJ AG'rxn=-257.2 kJ 19. For a given reaction, AH = +35.5 kJ/mol and AS = +83.6 J/Kmol. The reaction is Assume that AH and AS do not vary with temperature. spontaneous A) at T < 425 K B) at T > 425 K C) at all temperatures D) at T > 298 K E) at T < 298 K
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Hess's law states that total energy change during course of a reaction is independent of the sequence of steps taken in the reaction. Hence, the energy of different independent reactions can be used to calculate the energy of a net reaction.

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