Start with writing a balanced equation:
4Fe3O4+O2 => 6Fe2O3
Then use stoichiometric coefficients and molar masses to solve the remainder of the problem.
A 2.00g sample of Fe3O4 is reacted with with 8.00g of O2 to produce Fe2O3.
a) What mass of Fe2O3 will be produced?
b) What mass of Fe2O3 will actually be produced if the percentage yield for reaction is 85% produced?
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