For the equilibrium N_2(g) + 3H_2(g) leftharpoons 2NH_3(g), the expression for K_p is

For the equilibrium $N_2(g) + 3H_2(g) \rightleftharpoons 2NH_3(g)$ , the expression for $K_p$ is

\frac{p_{N_2}\,p_{H_2}^3}{p_{NH_3}^2}

\frac{p_{NH_3}}{p_{N_2}\,p_{H_2}}

\frac{2p_{NH_3}}{p_{N_2} + 3p_{H_2}}

\frac{p_{NH_3}^2}{p_{N_2}\,p_{H_2}^3}

Explanation

Partial pressures of the products go on top, each raised to the power of its coefficient in the equation.

Derived from ZIMSEC Chemistry Paper 2, November 2014, Q1

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