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

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Question 16
H

Relative atomic masses (ArA_rAr​): H=1\text{H} = 1H=1 O=16\text{O} = 16O=16 Mg=24\text{Mg} = 24Mg=24 S=32\text{S} = 32S=32

What is the percentage by mass of water in magnesium sulfate crystals, MgSO4.7H2O\text{MgSO}_4.7\text{H}_2\text{O}MgSO4​.7H2​O?

[1]
A

34.1 %34.1\ \%34.1 %

B

42.9 %42.9\ \%42.9 %

C

48.8 %48.8\ \%48.8 %

D

51.2 %51.2\ \%51.2 %

Markscheme

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

  1. GCSE
  2. /Chemistry
  3. /3.1 Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations

40 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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