Write the equilibrium constant expressions for the following reactions: 2 CO(g) + O2(g) ⇌ 2 CO2(g)

The equilibrium constant (K) is a numerical value that expresses the ratio of the concentrations of products to reactants at equilibrium for a given chemical reaction. It is specific to a particular reaction at a certain temperature and indicates the extent to which a reaction proceeds. A large K value suggests that products are favored, while a small K value indicates that reactants are favored.

The reaction quotient (Q) is a measure of the relative concentrations of reactants and products at any point in time during a reaction. It is calculated using the same formula as the equilibrium constant but with the current concentrations. Comparing Q to K helps determine the direction in which a reaction will proceed to reach equilibrium: if Q < K, the reaction shifts right to produce more products, and if Q > K, it shifts left to produce more reactants.

Stoichiometry refers to the coefficients of reactants and products in a balanced chemical equation, which are used to formulate the equilibrium constant expression. For the reaction 2 CO(g) + O2(g) ⇌ 2 CO2(g), the equilibrium expression is K = [CO2]^2 / ([CO]^2[O2]), where the concentrations are raised to the power of their respective coefficients. This reflects the relationship between the amounts of substances at equilibrium.