Question

Tennantite is an ore of copper with the formula Cu₁₂As₄S₁₃. how many moles of copper are present in a sample of tennantite with a mass of 2350 grams?

Answer 1

19.1 moles of copper in 2350 grams of tennantite

Step-by-step explanation:

Lets start by finding how many moles of tennantite are contained in 2350 grams of the material.

The molar mass of Cu12As4S13 is 1479 grams/mole.

The moles of Cu12As4S13: (2350 grams)/(1479 grams/mole) = 1.5889 or 1.59 moles to 3 sig figs

Since each molecule of tennantite (TEN) contains 12 copper atoms, there would be (12 atoms Cu/TEN)*(1.59 moles TEN) = 19.1 moles of copper