Answer to Question #73418 in General Chemistry for Nancy Giglia

Question

A team of geologists has found a possible iron ore source, which happens to be magnetic. They have analysed a 1 kg sample of ore as follows:

The sample was crushed and passed over a magnetic belt to separate magnetite from the nonmagnetic residue. An amount of 345 g of magnetic ore was obtained. The non-magnetic residue was placed in a tank and underwent froth floatation. The lighter, copper-containing material floated while the heavier, silicon-containing material sank. 152 g of copper ore was extracted Calculate the percentage composition of the original sample, with respect to iron ore and copper ore