Calculate the mass of iron that can be obtained from 500 grams of iron ore?

I dont relly remeber this but hopefully you guys can help?o:

there are a variety of ores: The iron itself is usually found in the form of magnetite (Fe3O4), hematite (Fe2O3), goethite (FeO(OH)), limonite (FeO(OH).n(H2O)) or siderite (FeCO3). So depends on ore; but rule of thumb is 66% so 330 g