DP Chemistry (last assessment 2024)

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Question 18M.3.hl.TZ1.a

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Date May 2018 Marks available [Maximum mark: 1] Reference code 18M.3.hl.TZ1.a
Level hl Paper 3 Time zone TZ1
Command term Calculate Question number a Adapted from N/A
a.
[Maximum mark: 1]
18M.3.hl.TZ1.a

Organic solvents are commonly used in the pharmaceutical industry.

Hexane and propanone have vapour pressures of 17 kPa and 24 kPa respectively at 20 °C.

Calculate the vapour pressure, in kPa, at 20 °C of a mixture containing 60% hexane and 40% propanone by mole fraction, using Raoult’s law and assuming the mixture is ideal.

[1]

Markscheme

«vapour pressure = 0.6 × 17 + 0.4 × 24 =»

19.8 «kPa»

[1 mark]

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