Question

Chalcopyrite (CuFeS2) is a principal mineral of copper. Calculate the number of
kilograms of Cu in 3.71 X 103kg of chalcopyrite.

Answer 1

Multiply the mass by 1000 to get the mass in grams

From there, divide by the molar mass of chalcopyrite to get moles chalcopyrite

1 mole chalcopyrite has 1 mole of Cu, so moles Cu = moles chalcopyrite from the previous step

Multiply moles of Cu * the molar mass of Cu to get the mass in grams

Divide by 1000 to get the mass in kg