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

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Question 7

Hydrated barium chloride has the formula BaCl2.2H2O\text{BaCl}_2.2\text{H}_2\text{O}BaCl2​.2H2​O. A sample is heated until all the water has been removed.

Relative atomic masses (ArA_rAr​): H=1\text{H} = 1H=1 O=16\text{O} = 16O=16 Cl=35.5\text{Cl} = 35.5Cl=35.5 Ba=137\text{Ba} = 137Ba=137

After complete dehydration, what percentage of the starting mass remains as solid barium chloride, BaCl2\text{BaCl}_2BaCl2​?

[1]
A

85.2 %85.2\ \%85.2 %

B

92.0 %92.0\ \%92.0 %

C

56.1 %56.1\ \%56.1 %

D

14.8 %14.8\ \%14.8 %

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

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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