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2.6 Calculations involving masses

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Question 32

A sample of hydrated iron(II) sulfate has the formula FeSO4⋅xH2O\mathrm{FeSO_{4}\cdot xH_{2}O}FeSO4​⋅xH2​O. Analysis shows that water makes up 45.3% of the sample by mass.

Relative formula masses: FeSO4=152\mathrm{FeSO_{4}} = 152FeSO4​=152, H2O=18\mathrm{H_{2}O} = 18H2​O=18.

What is the value of x?

[1]
A

x = 1

B

x = 7

C

x = 10

D

x = 8

Markscheme

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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