Question

Nitrogen and oxygen react at high temperatures. N2(g) + O2(g) equilibrium reaction arrow 2 NO(g) ΔH = 182.6 kJ (a) Write the expression for the equilibrium constant (Kc) for this reversible reaction. (Concentration equilibrium expressions take the general form: Kc = [C]c / [A]a . [B]b. Subscripts and superscripts that include letters must be enclosed in braces {}.)

Answer 1

The equilibrium reaction is written as

N₂ (g) + O₂ (g) <======> 2 NO (g)

The equilibrium constant for the reaction is simply the ratio of the equilibrium concentrations of the products and the reactants, all raised to appropriate exponents. The exponents are the stoichiometric co-efficients in the balanced chemical equation.

The equilibrium constant for the above reaction is written as

K_c = [NO]²/[N₂][O₂] (ans).