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2.6 Calculations involving masses

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Question 21

A hydrocarbon contains only carbon and hydrogen. Data from the analysis of a sample are shown in the table.

QuantityValue
mass of sample4.00 g
mass of carbon3.60 g
relative atomic mass of carbon12
relative atomic mass of hydrogen1

What is the simplest whole-number ratio of carbon atoms to hydrogen atoms in the hydrocarbon?

[1]
A

C:H=3:4\mathrm{C:H} = 3:4C:H=3:4

B

C:H=9:1\mathrm{C:H} = 9:1C:H=9:1

C

C:H=3:40\mathrm{C:H} = 3:40C:H=3:40

D

C:H=4:3\mathrm{C:H} = 4:3C:H=4:3

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2.6 Calculations involving masses Questions

  1. GCSE
  2. /Chemistry
  3. /2.6 Calculations involving masses

142 exam-style questions on Edexcel GCSE Chemistry 2.6 Calculations involving masses, covering 2.6.1 Relative formula mass and percentage composition, 2.6.2 Empirical and molecular formulae, 2.6.3 Conservation of mass, 2.6.4 Reacting masses and concentration in g dm⁻³, 2.6.5 The mole and the Avogadro constant, and 2.6.6 Limiting reactants and stoichiometry. Each one has a worked solution and a mark scheme showing where the marks go.

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