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2.6 Calculations involving masses

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Question 25
H

Magnesium chloride, MgCl2\mathrm{MgCl_{2}}MgCl2​, is an ionic compound. Relative atomic masses: Mg=24\mathrm{Mg} = 24Mg=24, Cl=35.5\mathrm{Cl} = 35.5Cl=35.5. The Avogadro constant is 6.02×1023 mol−16.02\times10^{23}\,\mathrm{mol^{-1}}6.02×1023mol−1.

What is the total number of ions in 9.50 g of magnesium chloride?

[1]
A

1.20×10231.20\times10^{23}1.20×1023

B

6.02×10226.02\times10^{22}6.02×1022

C

1.72×10251.72\times10^{25}1.72×1025

D

1.81×10231.81\times10^{23}1.81×1023

Markscheme

2.6 Calculations involving masses Questions

  1. GCSE
  2. /Chemistry
  3. /2.6 Calculations involving masses

55 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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