- $CuO$:
$n_{Cu}=n_{CuO}=0,23(mol)$
$\to m_{Cu}=0,23.64=14,72g$
- $CuSO_4$:
$n_{CuSO_4}=\dfrac{12}{160}=0,075(mol)$
$\Rightarrow n_{Cu}=n_{CuSO_4}=0,075(mol)$
$\to m_{Cu}=0,075.64=4,8g$
- $CuSO_4.5H_2O$:
$n_{CuSO_4.5H_2O}=\dfrac{5}{160+18.5}=0,02(mol)$
$\Rightarrow n_{Cu}=n_{CuSO_4.5H_2O}=0,02(mol)$
$\to m_{Cu}=0,02.64=1,28g$