A mineral contains an ionic compound with the formula Fe3S4\text{Fe}_3\text{S}_4Fe3S4.
The compound contains Fe2+\text{Fe}^{2+}Fe2+ ions, Fe3+\text{Fe}^{3+}Fe3+ ions and S2−\text{S}^{2-}S2− ions.
Calculate the simplest whole-number ratio of Fe2+\text{Fe}^{2+}Fe2+ ions to Fe3+\text{Fe}^{3+}Fe3+ ions in Fe3S4\text{Fe}_3\text{S}_4Fe3S4.
Show your working.
91 exam-style questions on AQA GCSE Chemistry 1.3 Properties of transition metals, covering 1.3.1 Comparison with Group 1 elements and 1.3.2 Typical properties of transition metals. Each one has a worked solution and a mark scheme showing where the marks go.