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2.6 Calculations involving masses

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Question 38

A compound has the formula (NH4)3PO4\mathrm{(NH_{4})_{3}PO_{4}}(NH4​)3​PO4​. Use Ar(H)=1A_r(\mathrm{H}) = 1Ar​(H)=1, Ar(N)=14A_r(\mathrm{N}) = 14Ar​(N)=14, Ar(O)=16A_r(\mathrm{O}) = 16Ar​(O)=16 and Ar(P)=31A_r(\mathrm{P}) = 31Ar​(P)=31.

a.

Calculate the relative formula mass, MrM_rMr​, of (NH4)3PO4\mathrm{(NH_{4})_{3}PO_{4}}(NH4​)3​PO4​.

[2]
b.

Calculate the percentage by mass of nitrogen in (NH4)3PO4\mathrm{(NH_{4})_{3}PO_{4}}(NH4​)3​PO4​.

Give your answer to 3 significant figures.

[2]
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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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