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2.6 Calculations involving masses

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Question 44

A solution of potassium bromide contains 4.515 × 1023 bromide ions. What amount of bromide ions, in moles, is in the solution? Use the Avogadro constant 6.02 × 1023 mol-1.

[1]
A

2.72×1047 mol2.72 \times 10^{47}\ \mathrm{mol}2.72×1047 mol

B

7.50 mol7.50\ \mathrm{mol}7.50 mol

C

0.750 mol0.750\ \mathrm{mol}0.750 mol

D

1.33 mol1.33\ \mathrm{mol}1.33 mol

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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