Kp and calculating equilibrium constantsEdexcel A-Level Chemistry: Mind map

Exam questions on Kp and calculating equilibrium constants

1. Dinitrogen tetroxide dissociates reversibly: N₂O₄(g) ⇌ 2NO₂(g). In an experiment at 350 K the equilibrium mixture contained 0.40 mol of N₂O₄ and 0.20 mol of NO₂, and the total pressure was 3.0 atm.
   Calculate the partial pressure of N₂O₄ and the value of Kp for this equilibrium, including its units.2 marks
2. In a sealed 2.00 dm³ vessel at 700 K, 1.00 mol of hydrogen and 1.00 mol of iodine were mixed and allowed to reach equilibrium: H₂(g) + I₂(g) ⇌ 2HI(g). At equilibrium the vessel contained 0.220 mol of hydrogen.
   Calculate the equilibrium concentration of hydrogen iodide.2 marks
3. A mixture of 0.800 mol of sulfur dioxide and 0.600 mol of oxygen was sealed in a 2.00 dm³ vessel at 1000 K and allowed to reach equilibrium: 2SO₂(g) + O₂(g) ⇌ 2SO₃(g). At equilibrium the vessel contained 0.600 mol of sulfur trioxide.
   Calculate the amounts of SO₂ and O₂ at equilibrium and the equilibrium concentration of each of the three gases.3 marks