When a 10 g sample of copper oxide is reduced by heating in the presence of carbon monoxide, how many moles of copper are formed?

how many mols of copper oxide (CuO) in 10 grams?

Cu = 63.5
O = 16
CuO = 79.5 grams/mol
so we have
10 grams / 79.5 g/mol = .126 mols of CuO
same number of mols of Cu