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Question bank·2.6 Calculations involving masses

2.6 Calculations involving masses

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Question 48

H

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

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

[1]

A

$1.20×10231.20\times10^{23}$

B

$6.02×10226.02\times10^{22}$

C

$1.72×10251.72\times10^{25}$

D

$1.81×10231.81\times10^{23}$

Markscheme

2.6 Calculations involving masses Questions

GCSE
Chemistry
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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