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2 marksSulfuric Acid

CAPE Chemistry Unit 2 · 2006 · Paper 2 · Question 4(a)(ii)

For the equilibrium system: 2SO₂(g) + O₂(g) ⇌ 2SO₃(g), ΔH = -197 kJ mol⁻¹.

Give TWO characteristic features of a system in dynamic equilibrium.

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  1. 4(a)(i)State Le Chatelier's principle.[2 marks]
  2. 4(a)(iii)Write an expression for the equilibrium constant, K_p, for the equilibrium system described.[1 mark]
  3. 4(a)(iv)The equilibrium constant, K_p, for this reaction is 4.0 × 10¹⁹ Pa⁻¹ at 25 °C. Use the value of K_p to comment on the position of equilibrium at 25 °C and the…[2 marks]
  4. 4(b)(i)Using Le Chatelier's principle, predict and explain how the position of equilibrium and the concentration of reactants and products are affected when the…[3 marks]
  5. 4(b)(ii)Using Le Chatelier's principle, predict and explain how the position of equilibrium and the concentration of reactants and products are affected when the…[3 marks]
  6. 4(b)(iii)Using Le Chatelier's principle, predict and explain how the position of equilibrium and the concentration of reactants and products are affected by using a…[2 marks]
  7. 4(c)When a 2:1 mixture of SO₂(g) and O₂(g) at a total initial pressure of 5 atm is passed over a catalyst at 425 °C, the partial pressure of SO₃(g) at equilibrium…[5 marks]

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