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2.6 Calculations involving masses

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Question 13

A sample contains 15.5 g of sodium oxide, $Na2O\mathrm{Na_2O}$ , an ionic compound. Relative atomic masses: $Na=23\mathrm{Na}=23$ , $O=16\mathrm{O}=16$ . Use the Avogadro constant $mol−16.02\times10^{23}\,\mathrm{mol^{-1}}$ .

What is the number of sodium ions in this sample?

[1]

A

$1.51×10231.51\times10^{23}$

B

$4.52×10234.52\times10^{23}$

C

$4.79×10234.79\times10^{23}$

D

$3.01×10233.01\times10^{23}$

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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