Final answer:
The expression for Kp for the forward reaction N₂(g) + O₂(g) ⇌ 2NO(g) is Kp = [P(NO)]² / ([P(N₂)] × [P(O₂)]), where the symbols in brackets denote the partial pressures of the gases.
Step-by-step explanation:
To write the expression for the equilibrium constant in terms of the partial pressures (Kp) for the forward reaction given:
N₂(g) + O₂(g) ⇌ 2NO(g)
The Kp expression is determined by the ratio of the product of the partial pressures of the products raised to their stoichiometric coefficients to the product of the partial pressures of the reactants raised to their stoichiometric coefficients. The expression for Kp is:
Kp = [P(NO)]² / ([P(N₂)] × [P(O₂)])
Where [P(NO)] is the partial pressure of nitric oxide, [P(N₂)] is the partial pressure of nitrogen, and [P(O₂)] is the partial pressure of oxygen.