DP Chemistry (first assessment 2025)

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

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

1.

[Maximum mark: 1]

22M.1A.SL.TZ1.1

0.2 mol of sodium hydrogencarbonate is decomposed by heating until constant mass.

2 NaHCO₃(s) → Na₂CO₃ (s) + H₂O (g) + CO₂ (g)

How many moles of gas are produced?

A. 0.1

B. 0.2

C. 0.3

D. 0.4

[1]

Markscheme

B

Syllabus sections

Structure 1. Models of the particulate nature of matter » Structure 1.4—Counting particles by mass: The mole » Structure 1.4.5—The molar concentration is determined by the amount of solute and the volume of solution. Solve problems involving the molar concentration, amount of solute and volume of solution.