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2.6 Calculations involving masses

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Question 19
F

A student heats 5.60 g of iron in air until it has all reacted. The iron oxide formed has a mass of 8.00 g. Relative atomic masses: O=16\mathrm{O} = 16O=16, Fe=56\mathrm{Fe} = 56Fe=56.

What is the empirical formula of the iron oxide?

[1]
A

Fe2O3\mathrm{Fe_{2}O_{3}}Fe2​O3​

B

FeO\mathrm{FeO}FeO

C

Fe3O2\mathrm{Fe_{3}O_{2}}Fe3​O2​

D

Fe4O3\mathrm{Fe_{4}O_{3}}Fe4​O3​

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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