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2.6 Calculations involving masses

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Question 12

A solid is heated inside a sealed container until it has completely broken down into a gas and a new solid. Before heating, the solid had a mass of 68.4 g. The gas formed has a mass of 4.2 g. What mass of the new solid is formed?

[1]
A

64.2 g

B

68.4 g

C

72.6 g

D

4.2 g

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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