DP Chemistry (first assessment 2025)

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Question 22M.1A.SL.TZ1.2

Date	May 2022	Marks available	[Maximum mark: 1]	Reference code	22M.1A.SL.TZ1.2
Level	SL	Paper	1A	Time zone	TZ1
Command term	Solve	Question number	2	Adapted from	N/A

2.

[Maximum mark: 1]

22M.1A.SL.TZ1.2

Which sample contains the fewest moles of HCl?

N_A = 6.02 × 10²³mol^–1.

Molar volume of an ideal gas at STP = 22.7 dm³mol^–1.

A. 10.0 cm³ of 0.1 mol dm^–3 HCl (aq)

B. 6.02 × 10²⁴ molecules of HCl (g)

C. 0.365 g of HCl (g)

D. 2.27 dm³ of HCl (g) at STP

[1]

Markscheme

A

Syllabus sections

Structure 1. Models of the particulate nature of matter » Structure 1.5—Ideal gases » Structure 1.5.3—The molar volume of an ideal gas is a constant at a specific temperature and pressure. Investigate the relationship between temperature, pressure and volume for a fixed mass of an ideal gas and analyse graphs relating these variables.