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2.6 Calculations involving masses

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Question 2

A chemist analyses a compound containing only silicon and oxygen.

A sample of the compound contains 1.40 g of silicon and 1.60 g of oxygen.

Relative atomic masses: Si = 28, O = 16

a.

Calculate the ratio number for silicon.

[1]
b.

Calculate the ratio number for oxygen.

[1]
c.

Use your answers to (a) and (b) to give the simplest whole-number ratio of silicon atoms to oxygen atoms in the compound.

[1]
d.

Give the formula of the compound that matches this ratio.

[1]
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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