Question

Calulate the maximum mass of copper that could be obtained from 79.5g of copper oxide

Answer 1

Answer:

63.5 copper

Explanation:

You have the balanced equation: CuO + H2 --> Cu + H2O. You can use stoichiometry and see there is a 1:1 molar ratio between CuO and Cu.

1) work out the moles of CuO.

- mol=mass/mol mass = 79.5g/(63.5+16.0) = 1 mol CuO

2) work out mol Cu

- from the 1:1 mol ratio you know if you have 1 mol CuO you must have 1 mol Cu. So mol Cu=1 mol

3) work out mass of Cu

- mol=mass/mol mass therefore mass= mol x molar mass = 1 x 63.5g/mol-1 = 63.5g Cu