Calculate the atom economy for the production of magnesium oxide (MgO{\text{MgO}}MgO) in the following thermal decomposition reaction:
MgCO3→MgO+CO2 \text{MgCO}_3 \rightarrow \text{MgO} + \text{CO}_2 MgCO3→MgO+CO2You must show your working.
(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: MgO=40\text{MgO} = 40MgO=40)
Practise Edexcel GCSE Chemistry Quantitative analysis with exam-style questions for Foundation and Higher tier. 100 questions, matched to the Edexcel GCSE Chemistry (1CH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.