Skip to content

Course home

2.6 Calculations involving masses

Easy Medium Hard

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74

Question 11

A student places 0.60 g of magnesium in a crucible with a lid. The crucible, lid and magnesium have a total mass of 32.80 g. The student heats the magnesium to constant mass, lifting the lid at intervals to admit air. No solid is lost.

$2Mg(s)+O2(g)→2MgO(s)2\mathrm{Mg(s)} + \mathrm{O_2(g)} \rightarrow 2\mathrm{MgO(s)}$

Relative atomic masses: $Mg=24\mathrm{Mg} = 24$ , $O=16\mathrm{O} = 16$ .

What balance reading should the student record after the crucible has cooled?

[1]

A

$g32.40\,\mathrm{g}$

B

$g33.20\,\mathrm{g}$

C

$g33.80\,\mathrm{g}$

D

$g32.80\,\mathrm{g}$

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.

Question bank