Answer:
in 79.85 g of Fe2O3 there will be 0.5 moles of Fe2O3
Step-by-step explanation:
To find the number of moles we must calculate the molecular weight of iron oxide, for that we use the periodic table:
mFe = 55.845 g/mol
mO = 15.999 g/mol
mFe2O3 = (2x55.845) + (3x15.999) = 159.687 g/mol
1 mole of iron oxide weighs 159.687 g, therefore, to calculate the number of moles present in 79.85 g it will be equal to:
nFe2O3 = 79.85/159.687 = 0.5 moles