Skip to content

Course home

Sign up

2.6 Calculations involving masses

EasyMediumHard
12345678910111213141516171819202122
Question 20
H

Magnesium reacts with hydrochloric acid: Mg+2HCl→MgCl2+H2\mathrm{Mg} + 2\mathrm{HCl} \rightarrow \mathrm{MgCl_{2}} + \mathrm{H_{2}}Mg+2HCl→MgCl2​+H2​. A mixture contains 0.10 mol Mg\mathrm{Mg}Mg and 0.15 mol HCl\mathrm{HCl}HCl. Which reactant is limiting?

[1]
A

magnesium, because 0.10 mol is less than 0.15 mol

B

magnesium, because it is needed in the smaller amount

C

neither, because they react in the ratio shown

D

hydrochloric acid, because 0.20 mol would be needed

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.

Question bank