Based on the reaction for the removal of SO2, and the given data values of ΔG°f and ΔH°f for reactants and products, we’re asked to determine Kp of the reaction at a temperature of 298 K.
Remember that Kp is the Equilibrium constant in terms of pressure.
Additionally, Kp is related to the standard Gibbs free energy (ΔG°rxn) by the following equation:
ΔG°rxn is the Gibbs energy of the reaction
R is the gas constant (R = 8.314 J/molK)
T is the temperature (in K)
Kp is the equilibrium constant in terms of pressure.
SO2(g) + 2H2S(g) ⇌ 3 S(s) + 2H 2O(g)
is the basis of a suggested method for removal of SO 2, a pollutant that irritates airways causing coughing, from power-plant stack gases. The values below may be helpful when answering questions about the process.
Calculate the equilibrium constant Kp for the reaction at a temperature of 298 K. Express the equilibrium constant to one significant figure.
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