Calculate the relative formula mass (MrM_rMr) of sodium carbonate, Na2CO3\text{Na}_2\text{CO}_3Na2CO3.
Relative atomic masses (ArA_rAr): Na=23\text{Na} = 23Na=23, C=12\text{C} = 12C=12, O=16\text{O} = 16O=16.
258 exam-style questions on Edexcel GCSE Chemistry Calculations involving masses. Each one has a worked solution and a mark scheme showing where the marks go.