DP Physics (last assessment 2024)

Question 21M.2.SL.TZ2.2b

Date	May 2021	Marks available	[Maximum mark: 2]	Reference code	21M.2.SL.TZ2.2b
Level	SL	Paper	2	Time zone	TZ2
Command term	Calculate	Question number	b	Adapted from	N/A

[Maximum mark: 2]

21M.2.SL.TZ2.2b

The graph shows the variation with temperature T of the pressure P of a fixed mass of helium gas trapped in a container with a fixed volume of 1.0 × 10⁻³m³.

(b)

Helium has a molar mass of 4.0 g. Calculate the mass of gas in the container.

[2]

Markscheme

$\frac{100 \times 10^{3} \times 10^{- 3}}{250 \times 8.31} = « 0.048 mol »$ ✓

$« 0.048 \times 4 = » 0.19 « g »$ ✓

Allow any correct data point to be used.

Allow ECF from MP1

Syllabus sections

Core

Core » Topic 3: Thermal physics » 3.2 – Modelling a gas

Core » Topic 3: Thermal physics

Question 21M.2.SL.TZ2.2b

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