We are being asked to calculate the equilibrium constant, Kp, for this reaction:
2 SO2(g) + O2(g) ⇌ 2 SO3(g)
Recall that the equilibrium constant is the ratio of the products and reactants. We use Kp when dealing with pressure:
▪ only aqueous and gaseous species are included in the equilibrium expression
▪ the coefficient of each compound in the reaction equation will be the exponent of the concentrations in the equilibrium expression
Consider the reaction: 2SO2(g) + O2(g) ⇌ 2SO3(g)
When 0.60 atm of SO2 and 0.40 atm of O2 are placed in a container, the reaction proceeds and it is found that 0.50 atm of SO3 is produced at equilibrium. Calculate the value of Kp for this reaction.