An investigator studied the reaction of heated aluminium foil with oxygen gas in a crucible.
The word equation for the reaction is:
aluminium+oxygen→aluminium oxide \text{aluminium} + \text{oxygen} \rightarrow \text{aluminium oxide} aluminium+oxygen→aluminium oxideThe measurements recorded during the experiment are as follows:
| Mass in g\text{g}g | |
|---|---|
| Crucible | 18.5018.5018.50 |
| Crucible and aluminium foil | 21.2021.2021.20 |
| Crucible and aluminium oxide | 23.6023.6023.60 |
Calculate the simplest whole number ratio of:
moles of aluminium atoms:moles of oxygen atoms \text{moles of aluminium atoms} : \text{moles of oxygen atoms} moles of aluminium atoms:moles of oxygen atomsDetermine the balanced chemical equation for this reaction.
Relative atomic masses (ArA_rAr): O=16\text{O} = 16O=16, Al=27\text{Al} = 27Al=27
38 exam-style questions on AQA GCSE Chemistry 3.2 Use of amount of substance in relation to masses of pure substances, covering 3.2.1 Moles (HT only), 3.2.2 Amounts of substances in equations (HT only), 3.2.3 Using moles to balance equations (HT only), 3.2.4 Limiting reactants (HT only), and 3.2.5 Concentration of solutions. Each one has a worked solution and a mark scheme showing where the marks go.