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2.6 Calculations involving masses

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Question 20
H

A student heats hydrated copper sulfate, CuSO4⋅xH2O\mathrm{CuSO_{4}\cdot xH_{2}O}CuSO4​⋅xH2​O, in a crucible to remove the water of crystallisation. The crucible is cooled and weighed after each heating.

MeasurementMass / g
empty crucible20.00
crucible + hydrated copper sulfate22.50
after 1st heating21.90
after 2nd heating21.70
after 3rd heating21.60
after 4th heating21.60

Relative formula masses: CuSO4=159.5\mathrm{CuSO_{4}} = 159.5CuSO4​=159.5, H2O=18\mathrm{H_{2}O} = 18H2​O=18.

What is the value of x?

[1]
A

6

B

5

C

4

D

3

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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