1. At equilibrium a mixture of N₂, H₂, and NH₃ gas at 500°C is determined to consist of 0.602 mol/L of N2, 0.420 mol/L of H2, and 0.113 mol/L of NH3.What is the equilibrium constant for the reaction N₂(g) + 3H₂(g) ←→ 2NH₃(g) at this temperature?

2. The reaction AB₂C(g) ←→ B₂(g) + AC(g) reached equilibrium at 900 K in a 5.00 L vessel. At equilibrium 0.084 mol of AB₂C, 0.035 mol of B₂, and 0.059 mol of AC were detected. What is the equilibrium constant at this temperature for this system?

3. At equilibrium a 1.0 L vessel contains 20.0 mol of H₂, 18.0 mol of CO₂, 12.0 mol of H₂O, and 5.9 mol of CO at 427°C.What is the value of K at this temperature for the following reaction?

CO₂(g) + H₂(g) ←→ CO(g) + H₂O(g)

Write the expression for Kc and Kp if applicable, for the following reversible reactions at equilibrium:

1. HF(aq) + H₂O (l) ←→H₃O ⁺ (aq) + F^- (aq)

2. 2 NO(q) + O₂ (g) ←→2 NO₂ (q)

3. 2HgO(s)←→2Hg(l) + O₂(g)

4. H₂SO₃(aq) + H₂O(l) ←→H₃O+(aq) + HSO₃ (aq)

5. H₂(g) + I₂(g) ←→2HI(g)

Labels: Chemical Equilibrium, Chemistry Lecture, Sample Problems