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2 marksPrinciples of Chemical Equilibrium

CAPE Chemistry Unit 1 · 2016 · Paper 2 · Question 5(a)(ii)

The following equation represents the reaction between hydrogen and iodine: H₂(g) + I₂(g) ⇌ 2 HI(g), ΔH = -10 kJ mol⁻¹. The reaction is said to be in a state of equilibrium at a particular temperature and pressure.

Write the expression for the equilibrium constant in terms of partial pressures, Kₚ, for the reaction shown by the equation above.

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Other parts of this question

  1. 5(a)(i)State FOUR characteristics of a reaction in 'dynamic equilibrium'.[4 marks]
  2. 5(a)(iii)State TWO factors which would NOT affect the equilibrium of the reaction shown by the equation above.[2 marks]
  3. 5(b)(i)Describe the effect of decreasing the temperature on the equilibrium of the reaction[2 marks]
  4. 5(b)(ii)Describe the effect of decreasing the temperature on the value of Kₚ.[2 marks]
  5. 5(c)When 0.5 mol of hydrogen and 0.5 mol of iodine are allowed to reach equilibrium in a 1.00 dm³ flask at 500 °C and 1.01 × 10⁵ N m⁻², the amount of hydrogen…[3 marks]

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