The reaction SO2(g)+2H2S(g)⇌3S(s)+2H2O(g)SO2(g)+2H2S(g)⇌3S(s)+2H2O(g) is the basis of a suggested method for removal of SO2SO2, 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∘fΔGf∘ (kJ/mol)(kJ/mol) ΔH∘fΔHf∘ (kJ/mol)(kJ/mol) H2O(g)H2O(g) −−228.6 −−241.8 H2O(l)H2O(l) −−237.1 −−285.8 SO2(g)SO2(g) −−300.4 −−296.9 SO3(g)SO3(g) −−370.4 −−395.2 H2S(g)H2S(g) −−33.01 −−20.17 S(s)S(s) 0 0   Assume that the partial pressure of sulfur dioxide,  PSO2PSO2, is equal to the partial pressure of dihydrogen sulfide,  PH2SPH2S, and therefore PSO2=PH2SPSO2=PH2S. If the vapor pressure of water is 24 torrtorr , calculate the equilibrium partial pressure of SO2SO2  (PSO2PSO2) in the system at 298 KK. Express the pressure in atmospheres to two significant figures.   Kp= 8*10^15

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Author:William L. Masterton, Cecile N. Hurley
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Chapter12: Gaseous Chemical Equilibrium
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The reaction

SO2(g)+2H2S(g)⇌3S(s)+2H2O(g)SO2(g)+2H2S(g)⇌3S(s)+2H2O(g)

is the basis of a suggested method for removal of SO2SO2, 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∘fΔGf∘
(kJ/mol)(kJ/mol)
ΔH∘fΔHf∘
(kJ/mol)(kJ/mol)
H2O(g)H2O(g) −−228.6 −−241.8
H2O(l)H2O(l) −−237.1 −−285.8
SO2(g)SO2(g) −−300.4 −−296.9
SO3(g)SO3(g) −−370.4 −−395.2
H2S(g)H2S(g) −−33.01 −−20.17
S(s)S(s) 0 0

 

Assume that the partial pressure of sulfur dioxide,  PSO2PSO2, is equal to the partial pressure of dihydrogen sulfide,  PH2SPH2S, and therefore PSO2=PH2SPSO2=PH2S. If the vapor pressure of water is 24 torrtorr , calculate the equilibrium partial pressure of SO2SO2  (PSO2PSO2) in the system at 298 KK.
Express the pressure in atmospheres to two significant figures.
 
Kp= 8*10^15
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