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2.6 Calculations involving masses

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Question 19

Sodium hydrogencarbonate, NaHCO3\mathrm{NaHCO_{3}}NaHCO3​, contains sodium, hydrogen, carbon and oxygen. Use Na=23\mathrm{Na} = 23Na=23, H=1\mathrm{H} = 1H=1, C=12\mathrm{C} = 12C=12 and O=16\mathrm{O} = 16O=16.

Which element makes up 14.3% of the mass of sodium hydrogencarbonate?

[1]
A

sodium

B

carbon

C

hydrogen

D

oxygen

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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