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2.6 Calculations involving masses

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Question 23

A 12.5 g sample of pure calcium carbonate is heated strongly until it has decomposed completely. Calcium oxide and carbon dioxide are formed.

CaCO3(s)→CaO(s)+CO2(g)\mathrm{CaCO_{3}(s) \rightarrow CaO(s) + CO_{2}(g)}CaCO3​(s)→CaO(s)+CO2​(g)

Relative atomic masses: C = 12, O = 16, Ca = 40

Calculate the mass of carbon dioxide formed.

[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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