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Question bank·3.1 Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations

3.1 Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations

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Question 14

Relative atomic masses ( $A_r$ ): $Na=23\text{Na} = 23$ $O=16\text{O} = 16$ $S=32\text{S} = 32$

Sodium sulfite has the formula $Na2SO3\text{Na}_2\text{SO}_3$ .

Which value is the relative formula mass ( $M_r$ ) of sodium sulfite?

[1]

A

$103$

B

$126$

C

$142$

D

$94$

Markscheme

3.1 Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations Questions

GCSE
Chemistry
3.1 Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations

95 exam-style questions on AQA GCSE Chemistry 3.1 Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations, covering 3.1.1 Conservation of mass and balanced chemical equations, 3.1.2 Relative formula mass, 3.1.3 Mass changes when a reactant or product is a gas, and 3.1.4 Chemical measurements. Each one has a worked solution and a mark scheme showing where the marks go.

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