## Chemistry and Chemical Reactivity (9th Edition)

$7.36\ kg$ of iron
Atomic weights (g/mol): $Fe: 55.845, \ S: 32.06$ Molar mass of $FeS_2$: $119.965\ g/mol$ Mass fraction of Fe: $55.845\div119.965\times100\%=46.55\%$ In 15.8 kg of iron pyrite: $15.8\times46.55/100=7.36\ kg$