The table gives the relative atomic masses of oxygen and phosphorus.
| Element | O\text{O}O | P\text{P}P |
|---|---|---|
| Relative atomic mass (ArA_rAr) | 16 | 31 |
A metal, M, forms two compounds.
| Compound | Formula | Relative formula mass (MrM_rMr) |
|---|---|---|
| Metal phosphate | M3(PO4)2\text{M}_3(\text{PO}_4)_2M3(PO4)2 | 358 |
| Metal oxide | M2O3\text{M}_2\text{O}_3M2O3 | Unknown |
Calculate the relative formula mass (MrM_rMr) of the metal oxide.
Show your working.
95 exam-style questions on AQA GCSE Chemistry 3.1 Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations, covering 3.1.1 Conservation of mass and balanced chemical equations, 3.1.2 Relative formula mass, 3.1.3 Mass changes when a reactant or product is a gas, and 3.1.4 Chemical measurements. Each one has a worked solution and a mark scheme showing where the marks go.