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

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Question 30

Relative atomic masses (ArA_rAr​): H=1\text{H} = 1H=1 C=12\text{C} = 12C=12 O=16\text{O} = 16O=16 Na=23\text{Na} = 23Na=23

A 20.0 g sample of sodium carbonate crystals, Na2CO3.10H2O\text{Na}_2\text{CO}_3.10\text{H}_2\text{O}Na2​CO3​.10H2​O, is heated until all the water shown in the formula has been removed. No other substance is lost.

Calculate the percentage by mass of water in the crystals and the mass of solid remaining after heating.

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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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