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5 marksKinetic Theory

CAPE Chemistry Unit 1 · 2006 · Paper 2 · Question 9(b)(i)

A fourth compound, Z, (b.p = 97.2°C) forms a non-ideal mixture with water which boils at 88.1°C at 0.43 mole fraction of Z.

Construct the b.p / composition curve for the mixture of Z in water. Include in your diagram all data given, and label the two phases present.

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Other parts of this question

  1. 9(a)State which type of distillation is BEST suited for separating EACH compound from a mixture of the compound in water.[3 marks]
  2. 9(b)(ii)Use the diagram drawn in (b) (i) to explain why this mixture cannot be completely separated using fractional distillation.[8 marks]
  3. 9(c)(i)Suggest ONE advantage and ONE disadvantage of carrying out the distillation under increased pressure[2 marks]
  4. 9(c)(ii)Suggest TWO industries that utilize the process.[2 marks]

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