The reaction
SO2(g)+2H2S(g)⇌3S(s)+2H2O(g)
is the basis of a suggested method for removal of SO2, a pollutant that irritates airways causing coughing, from power-plant stack gases.
The values below may be helpful when answering questions about the process.
Substance | ΔG∘f (kJ/mol) |
ΔH∘f (kJ/mol) |
H2O(g) | −228.6 | −241.8 |
H2O(l) | −237.1 | −285.8 |
SO2(g) | −300.4 | −296.9 |
SO3(g) | −370.4 | −395.2 |
H2S(g) | −33.01 | −20.17 |
S(s) | 0 | 0 |
Kp = | 8×1015 |
Assume that the partial pressure of sulfur dioxide, PSO2, is equal to the partial pressure of dihydrogen sulfide, PH2S, and therefore PSO2=PH2S. If the vapor pressure of water is 28 torr , calculate the equilibrium partial pressure of SO2 (PSO2) in the system at 298 K.
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