The most common source of copper (Cu) is the mineral chalcopyrite (CuFeS2). How many kilograms of chalcopyrite must be mined to obtain 315 g of pure Cu?

Answer 1

You need x kg, where (using mol wts)
x * Cu/CuFeSO2 = 0.315
So look 'em up and do the math

Answer 2

typo
x * Cu/CuFeSO2 = 0.315 --remove the O to make it read
x * Cu/CuFeS2 = 0.315

Answer 3

oops. Guess I'm just used to typing SO2 in other places.
But I'm sure Janice caught my typo.