posted by rose .
if a sample of iron(III) oxide contains 22.56g of iron, what is the mass of the sample?
do u just find the molar masses?
The molecular formula for iron(III) oxide is Fe2O3.
This means that 2 moles of Fe=1 mole of Fe2O3.
22.65g of Fe*( 1 mole of Fe/55.8 g)= moles of Fe
moles of Fe*(1 mole of Fe2O3/2 moles of Fe)*(159.69 Fe2O3 g/mol)= mass of the sample