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2.6 Calculations involving masses

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Question 24
H

A sodium hydroxide solution has a concentration of 40.0 g dm−340.0\,\mathrm{g\,dm^{-3}}40.0gdm−3.

2NaOH+H2SO4→Na2SO4+2H2O\mathrm{2NaOH + H_{2}SO_{4} \rightarrow Na_{2}SO_{4} + 2H_{2}O}2NaOH+H2​SO4​→Na2​SO4​+2H2​O

Relative atomic masses: H=1\mathrm{H} = 1H=1, O=16\mathrm{O} = 16O=16, Na=23\mathrm{Na} = 23Na=23, S=32\mathrm{S} = 32S=32.

What volume of this solution contains exactly enough sodium hydroxide to react with 4.90 g of H2SO4\mathrm{H_{2}SO_{4}}H2​SO4​?

[1]
A

25.0 cm325.0\,\mathrm{cm^{3}}25.0cm3

B

50.0 cm350.0\,\mathrm{cm^{3}}50.0cm3

C

100 cm3100\,\mathrm{cm^{3}}100cm3

D

123 cm3123\,\mathrm{cm^{3}}123cm3

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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