6. Chemical Equilibrium
The Equilibrium State
Multiple Choice
Write the equilibrium expression for the following reaction.
4 NH3 (g) + 3 O2 (g) ⇌ 2 N2 (g) + 6 H2O (l)
A
B
C
D
Verified step by step guidance1
Identify the balanced chemical equation: 4 NH3 (g) + 3 O2 (g) ⇌ 2 N2 (g) + 6 H2O (l).
Recognize that the equilibrium expression is based on the concentrations of gases and aqueous solutions, not pure liquids or solids.
Note that H2O is a liquid in this reaction, so it is not included in the equilibrium expression.
Write the equilibrium expression using the concentrations of the gaseous reactants and products: K = [N2]^2 / ([NH3]^4 [O2]^3).
Ensure that the exponents in the equilibrium expression correspond to the stoichiometric coefficients from the balanced equation.
