8. A reaction has AH° = 100 kJ/mol and AS°=250 J/mol-K. Is the reaction spontaneous at room temperature? If not, under what temperature conditions will it become spontaneous?
8. A reaction has AH° = 100 kJ/mol and AS°=250 J/mol-K. Is the reaction spontaneous at room temperature? If not, under what temperature conditions will it become spontaneous?
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...
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Transcribed Image Text:5. Given the following reactions:
P:(8s) + 502(9)
- PĄO10 (s)
= -2697.0 kJ/mol
AG° = -457.18 kJ/mol
AG° = -428.66 kJ/mol
AG
2H2(9) + O2(9)
- 2H2O(g)
6H2O(g) + P4O10(s)
→ 4H3PO4(1)
(a) Determine the standard free energy of formation, AG°F, for phosphoric acid.
(b) How does your calculated result compare to the constant thermodynamic value from the
table? Explain.
6. Hydrogen sulfide is a pollutant found in natural gas. Following its removal, it is converted to
sulfur by the reaction:
2H2S(g) + SO2(g) Ss(s, rhombic) + 2H2O(1)
What is the equilibrium constant for this reaction? Is the reaction endothermic or exothermic?
7. Determine the standard free energy change, AGfº, for the formation of S (aq) given that
the AGF° for Ag*(ag) and Ag:S(s) are 77.1 kJ/mole and -39.5 kJ/mole respectively, and the solubility
product for A92S(s) is 8 xx 10-51.
8. A reaction has AH° = 100 kJ/mol and AS°=250 J/mol-K. Is the reaction spontaneous at room
temperature? If not, under what temperature conditions will it become spontaneous?
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