2.6 Calculations involving masses

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Question 14

A sample of a molecular phosphorus oxide has a total mass of 14.20 g. The sample contains 6.20 g of phosphorus. The compound has $M_r = 284$ .

Relative atomic masses: $O=16\mathrm{O} = 16$ , $P=31\mathrm{P} = 31$ .

Calculate the empirical formula of the phosphorus oxide.

[4]

Calculate the molecular formula of the phosphorus oxide.

[3]

Markscheme

2.6 Calculations involving masses Questions

GCSE
Chemistry
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.

Question bank·2.6 Calculations involving masses