Calculate the mass percent composition of iron for the first one of these iron ores?
Fe2O2 (hematite)
Answer:
The molar mass of Fe2O2 143.7 g/mole (2xFe 55.85g/mol + 2xO 16.0 g/mol) 2x55.85 / 143.7 0.777 (77.7% Fe) HOWEVER, Hematite is Fe2O3 (not Fe2O2), so the correct answer would be 69.9%.
