DP Chemistry (last assessment 2024)

Question 17N.2.sl.TZ0.b

Date	November 2017	Marks available	[Maximum mark: 2]	Reference code	17N.2.sl.TZ0.b
Level	sl	Paper	2	Time zone	TZ0
Command term	Calculate	Question number	b	Adapted from	N/A

[Maximum mark: 2]

17N.2.sl.TZ0.b

Menthol is an organic compound containing carbon, hydrogen and oxygen.

0.150 g sample of menthol, when vaporized, had a volume of 0.0337 dm³ at 150 °C and 100.2 kPa. Calculate its molar mass showing your working.

[2]

Markscheme

temperature = 423 K

«M $= \frac{{mRT}}{{pV}}$

«M $= \frac{{0.150\,{\text{g}} \times 8.31\,{\text{J}} {{\text{ K}}^{ - 1}}\,{\text{mol}}{}^{ - 1} \times 423\,{\text{K}}}}{{100.2\,{\text{kPa}} \times 0.0337\,{\text{d}}{{\text{m}}^3}}} =$ » 156 «g mol^–1»

Award [1] for correct answer with no working shown.

Accept “pV = nRT AND n = $\frac{m}{M}$ ” for M1.

Syllabus sections

Core

Core » Topic 1: Stoichiometric relationships » 1.3 Reacting masses and volumes

Core » Topic 1: Stoichiometric relationships

Question 17N.2.sl.TZ0.b

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