\(n_{CuO}=\dfrac{3,2}{80}=0,04\left(mol\right)\\
pthh:CuO+H_2SO_4\rightarrow CuSO_4+H_2O\)
0,04 0,04 0,04 0,04
\(m_{\text{dd}_{H_2SO_4}}=\dfrac{\left(0,04.36,5\right).100}{4,9}=29,79\left(g\right)\\
m_{\text{dd}_{CuSO_4}}=3,2+29,79-\left(0,04.2\right)=32,91\left(g\right)\\
C\%_{\text{dd}}=\dfrac{0,04.160}{32,91}.100\%=19,44\%\)