Question

A sample of an oxide of copper 

contains 8 g of copper combined with 1 g 

of oxygen. Find the empirical formula

Answer 1

$Cu = 8/63.546 = 0.126/0.0625 = 2$

$O = 1/16 = 0.0625/0.0625= 1$

The empirical formula of the Compound is therefore, $Cu_2O$