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

Just because the problem changed from grams to tons doesn't change anything except the units.

To determine the amount of copper ore needed to obtain one metric ton of copper, we need to calculate the percentage of copper present in the chalcopyrite and then use that information to find the total amount of chalcopyrite required to obtain one metric ton of copper.

1. First, find the percentage of copper in chalcopyrite by multiplying the percentage of copper in the chalcopyrite by the molecular weight of copper and dividing by the molecular weight of chalcopyrite.

The molecular weight of copper (Cu) is approximately 63.55 g/mol, and the molecular weight of chalcopyrite (CuFeS2) is approximately 183.52 g/mol.

Percentage of copper in chalcopyrite = (Percentage of copper in chalcopyrite / 100) * (Atomic weight of copper / Molecular weight of chalcopyrite)

Percentage of copper in chalcopyrite = (6.32 / 100) * (63.55 / 183.52)

2. Calculate the amount of chalcopyrite needed to obtain one metric ton (1000 kg) of copper by dividing the mass of copper by the percentage of copper in chalcopyrite:

Mass of chalcopyrite needed = Mass of copper / Percentage of copper in chalcopyrite

Mass of chalcopyrite needed = 1000 kg / (Percentage of copper in chalcopyrite)

Now, plug in the values to calculate the amount of chalcopyrite needed to obtain one metric ton of copper.