Question

For reactions involving gaseous reactants and products, the equilibrium constant $K_p$ is written in terms of:

• A. the pressure of the gases
• B. the molar volumes of the gases
• C. the partial pressures of the gases
• D. the mole fraction of the gases

Answer 1

The correct option is C the partial pressures of the gases

When the reactants and products of a reaction are in a gaseous state, the concentration terms in the expression for the equilibrium constant $\left(K_p\right)$can be replaced with partial pressures. The rate is directly proportional to the product of partial pressures of the products and inversely proportional to the product of partial pressures of the reactants raise the power of their respective stoichiometric coefficient.

$K_p=\frac{\text{Partial pressure of products}}{\text{Partial pressure of reactants}}$