How do you calculate the equilibrium constant Kp for a chemical reaction?

To calculate the equilibrium constant Kp for a chemical reaction, you need to determine the partial pressures of the reactants and products at equilibrium. Then, you can use these values to set up the expression for Kp, which is the ratio of the product of the partial pressures of the products to the product of the partial pressures of the reactants, each raised to the power of their respective stoichiometric coefficients in the balanced chemical equation.