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2.6 Calculations involving masses

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Question 26
H

Relative atomic masses: H=1\mathrm{H} = 1H=1, C=12\mathrm{C} = 12C=12, O=16\mathrm{O} = 16O=16. The Avogadro constant is 6.02×1023 mol−16.02\times10^{23}\,\mathrm{mol^{-1}}6.02×1023mol−1.

Statement 1: 16 g of oxygen gas, O2\mathrm{O_{2}}O2​, contains 6.02 × 1023 molecules

Statement 2: 2.0 g of hydrogen gas, H2\mathrm{H_{2}}H2​, contains the same number of molecules as 44 g of carbon dioxide

Statement 3: 1.8 g of water contains 1.81 × 1023 atoms

Which statements are correct?

[1]
A

1 only

B

1 and 2 only

C

2 and 3 only

D

1, 2 and 3

Markscheme

2.6 Calculations involving masses Questions

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

55 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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