What is the percent composition of a solute made with 40 g NaCI and 160ml H2O

             1.8 mol of CuO

Solution:

The balanced chemical equation is as follow,

                               2 Cu₂O  +  O₂     →     4 CuO

According to equation,

                     2 moles of Cu₂O produced  =  4 moles of CuO
So,
          0.900 moles of Cu₂O will produce  =  X moles of CuO

Solving for X,
                     X  =  (0.900 mol × 4 mol) ÷ 2 mol

                     X  =  1.8 mol of CuO