law of mass action

Question

For the reaction N₂(g) + 3H₂(g) ⇌ 2NH₃(g), the expression for equilibrium constant Kc is:

RankGuru · Accepted Answer

According to the **Law of Mass Action**, for a reversible chemical reaction at a constant temperature, the equilibrium constant ($K_c$) is the ratio of the product of molar concentrations of the products to that of the reactants, with each concentration term raised to a power equal to its stoichiometric coefficient in the balanced equation.
For the synthesis of ammonia:
$N_2(g) + 3H_2(g) \rightleftharpoons 2NH_3(g)$
$K_c = \frac{[NH_3]^2}{[N_2]^1 [H_2]^3}$
- Square brackets $[ ]$ denote molarity ($mol/L$).

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law of mass action

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