Solution stoichiometry question chemistry?

suppose that 4.00g of solid Fe2O3 is added to 25.0 ml of 0.5.. M HCl solution. what will the concentration of the Fe3+ be when all the HCl has reacted? what mass of Fe2O3 will not have reacted? the ans is .167 M Fe3+ and 3.667 g Fe3O2 i do not understand how to work out the problem. what do we do. find the... show more suppose that 4.00g of solid Fe2O3 is added to 25.0 ml of 0.5.. M HCl solution. what will the concentration of the Fe3+ be when all the HCl has reacted? what mass of Fe2O3 will not have reacted?

the ans is .167 M Fe3+ and 3.667 g Fe3O2

i do not understand how to work out the problem. what do we do. find the amount of moles of Fe3O2 n compare it
when doing the equation i got
HCl + Fe2O3 --> H20 + FeCl3. but i do not not where to go
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