Question

1 g mixture of cuprous and cupric oxides was reduced to 0.839 g metallic copper. What is the weight of cuprous oxide in sample

Answer 1

Cu₂O + CuO reduced to metallic Cu

Let us assume the moles of ​Cu₂O and ​CuO be x and y, respectively.


$$\begin{gathered} Eq.\left(1\right)x\times 143+y\times 79.5=1 \\ Eq.\left(2\right)x\times 127+y\times 63.5=0.839 \end{gathered}$$

Solving for y will give, y = 0.006912

Weight of Cuprous oxide (CuO) = ​$0.006912\times 79.5=0.55g$