Iron is extracted in a blast furnace. Carbon dioxide is a waste product.
Fe2O3+3CO→2Fe+3CO2 \mathrm{Fe_{2}O_{3} + 3CO \rightarrow 2Fe + 3CO_{2}} Fe2O3+3CO→2Fe+3CO2Relative atomic mass (ArA_rAr): Fe = 55.8
Relative formula mass (MrM_rMr): CO2\mathrm{CO_{2}}CO2 = 44.0
Use the equation: atom economy = mass of desired product in the equationtotal mass of all products in the equation×100\displaystyle \frac{\text{mass of desired product in the equation}}{\text{total mass of all products in the equation}}\times100total mass of all products in the equationmass of desired product in the equation×100
What is the atom economy for making iron?
45.8%
54.2%
55.9%
84.5%
152 exam-style questions on OCR GCSE Chemistry 5.1 Monitoring chemical reactions, covering 5.1.1 The technique of titration, 5.1.2 Theoretical mass, percentage yield and atom economy, 5.1.3 Concentration of a solution in mol/dm3, 5.1.4 Concentration calculations and titration results, 5.1.5 Molar gas volume and volumes of gases in reactions, and 5.1.6 Choosing a reaction pathway. Each one has a worked solution and a mark scheme showing where the marks go.