Question

10g of an oxide of copper contains 8.882g of copper. what is empirical formula of the copper oxide

Answer 1

Mass of copper oxide: 10g

Mass of copper: 8.882g

Mass of oxygen: 1.118g

Cu O

8.882 1.118

Divide by
`A_(r)` 8.882÷63.5 1.118÷16

0.14 0.07

Divide by the lowest number 0.14/0.07 0.07/0.07

2 1

Check the ratio now, Cu has 2 atoms and O has 1 atom .

The formula is
`Cu_(2) O`