How many moles of copper oxide is produced when 2 moles of copper combine with 1 mole of oxygen?

Copper (a brown-coloured metal) when heated in presence of air gets oxidised and forms a black-coloured substance called copper oxide.

The chemical equation for the reaction is:

$2{\mathrm{Cu}}_{\left(\mathrm{s}\right)}+{{\mathrm{O}}_2}_{\left(\mathrm{g}\right)}\to 2{\mathrm{CuO}}_{\left(\mathrm{s}\right)}$

The chemical equation clearly shows that 2 moles of copper combine with 1 mole of oxygen to form 2 moles of copper oxide.