The reactionSO2(g) + 2 H2S(g) 3 S(s) + 2 H2O(g)is the basis of a suggested method for removal of SO2 from power-plant stack gases. The standard free energy of each substance is given in Appendix C. (a) What is the equilibrium constant for the reaction at 298 K? (b) In principle, is this reaction a feasible method of removing SO2? (c) If PSO2 = PH2S and the vapor pressure of water is 25 torr, calculate the equilibrium SO2 pressure in the system at 298 K. (d) Would you expect the process to be more or less effective at higher temperatures?

Question

The reactionSO2(g) + 2 H2S(g)  3 S(s) + 2 H2O(g)is the basis of a suggested method for removal of SO2 from power-plant stack gases. The standard free energy of each substance is given in Appendix C. (a) What is the equilibrium constant for the reaction at 298 K? (b) In principle, is this reaction a feasible method of removing SO2? (c) If PSO2 = PH2S and the vapor pressure of water is 25 torr, calculate the equilibrium SO2 pressure in the system at 298 K. (d) Would you expect the process to be more or less effective at higher temperatures?

Substance	ÎGâf (kJ/mol)	ÎHâf (kJ/mol)
H2O(g)	â228.6	â241.8
H2O(l)	â237.1	â285.8
SO2(g)	â300.4	â296.9
SO3(g)	â370.4	â395.2
H2S(g)	â33.01	â20.17
S(s)	0	0

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