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2.6 Calculations involving masses

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Question 28
H

2.08 g of chromium reacts completely with 4.26 g of chlorine gas, Cl2\mathrm{Cl_{2}}Cl2​. The only product is 6.34 g of a chromium chloride. Relative atomic masses: Cl=35.5\mathrm{Cl} = 35.5Cl=35.5, Cr=52\mathrm{Cr} = 52Cr=52.

Which balanced equation matches these masses?

[1]
A

Cr+Cl2→CrCl2\mathrm{Cr + Cl_{2} \rightarrow CrCl_{2}}Cr+Cl2​→CrCl2​

B

2Cr+3Cl2→2CrCl3\mathrm{2Cr + 3Cl_{2} \rightarrow 2CrCl_{3}}2Cr+3Cl2​→2CrCl3​

C

Cr+2Cl2→CrCl4\mathrm{Cr + 2Cl_{2} \rightarrow CrCl_{4}}Cr+2Cl2​→CrCl4​

D

Cr+3Cl2→CrCl6\mathrm{Cr + 3Cl_{2} \rightarrow CrCl_{6}}Cr+3Cl2​→CrCl6​

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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