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Posted by on Friday, February 22, 2013 at 2:35pm.

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?

  • chem - , Friday, February 22, 2013 at 4:01pm

    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

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