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2.6 Calculations involving masses

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Question 12

An unlabelled sample is known to be either sodium nitrate, NaNO3\mathrm{NaNO_{3}}NaNO3​, or potassium nitrate, KNO3\mathrm{KNO_{3}}KNO3​.

QuantityValue
Mass of sample10.0 g
Mass of nitrogen in sample1.65 g

Relative atomic masses:

ElementArA_rAr​
N14
O16
Na23
K39

Calculate the percentage by mass of nitrogen in the sample. Use the formulae to state which compound the sample contains.

[5]
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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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