Law of mass action
Chemical Equilibrium · Chemistry
Study notes
For N₂ + 3H₂ ⇌ 2NH₃ at equilibrium: [N₂] = 0.5, [H₂] = 0.3, [NH₃] = 0.2 M. Find K_c. Step 1: K_c = [NH₃]²/([N₂][H₂]³). Step 2: Numerator: (0.2)² = 0.04. Step 3: Denominator: (0.5)(0.3)³ = 0.5 × 0.027 = 0.0135. Step 4: K_c = 0.04/0.0135 ≈ 2.96. K from concentration data — the law of mass action in action.