Calculate the atom economy for the production of magnesium oxide (MgO\text{MgO}MgO) in this reaction.
MgCO3(s)→MgO(s)+CO2(g) \text{MgCO}_3(\text{s}) \rightarrow \text{MgO}(\text{s}) + \text{CO}_2(\text{g}) MgCO3(s)→MgO(s)+CO2(g)You must show your working. Give your answer to 3 significant figures. (Relative atomic masses, ArA_rAr: C=12\text{C} = 12C=12, O=16\text{O} = 16O=16, Mg=24\text{Mg} = 24Mg=24; relative formula mass, MrM_rMr: magnesium oxide = 40)
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.