A student investigated the reaction of iron with bromine gas.
The word equation for the reaction is:
iron+bromine→iron bromide \text{iron} + \text{bromine} \rightarrow \text{iron bromide} iron+bromine→iron bromideThe student weighed:
The table below shows the student's results:
| Mass in g\text{g}g | |
|---|---|
| Glass tube | 25.30 |
| Glass tube and iron | 28.10 |
| Glass tube and iron bromide | 40.10 |
Calculate the simplest whole number ratio of:
moles of iron atoms:moles of bromine atoms \text{moles of iron atoms} : \text{moles of bromine atoms} moles of iron atoms:moles of bromine atomsDetermine the balanced chemical equation for the reaction.
Relative atomic masses (ArA_rAr): Br=80\text{Br} = 80Br=80, Fe=56\text{Fe} = 56Fe=56
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.