Question

A copper ore consists of 6.32% chalcopyrite, CuFeS2(s). How many grams of ore must be processed to obtain one gram of copper?

Answer 1

Just substitute into what you know. What is percent?
%Cu = (grams Cu/grams ore)*100 =
You know %Cu, you know grams Cu you want, solve for grams ore needed.

Answer 2

The above is incorrect and finds ratio chalcopyrite to ore. Not Cu to ore.