CuFeS2. What is the percentage of iron in a 80.3 g sample of this ore?
Molar mass of CuFeS2 is 183.54g Molar mass of Fe is 55.85g 55.85g/183.54g is .30429, x 100 30.429%. It'll be the same percentage in the 80.3g sample. 30.4% with 3 sig figs. .30429 x 80.3 if you want the mass of iron in that 80.3g sample.
