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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 18
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An agricultural chemist is preparing a liquid fertilizer containing hydrated calcium nitrate, Ca(NO3)2⋅4H2O\text{Ca(NO}_3)_2 \cdot 4\text{H}_2\text{O}Ca(NO3​)2​⋅4H2​O. To calculate the correct nutrient dosage, they must determine the relative formula mass (MrM_rMr​) of this compound.

Relative atomic masses (ArA_rAr​):

  • Ca=40.1\text{Ca} = 40.1Ca=40.1
  • N=14.0\text{N} = 14.0N=14.0
  • O=16.0\text{O} = 16.0O=16.0
  • H=1.0\text{H} = 1.0H=1.0
A

164.1164.1164.1

B

174.1174.1174.1

C

222.1222.1222.1

D

236.1236.1236.1

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

53 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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