$3FeS+12HNO_3\rightarrow Fe_2(SO_4)_3+9NO\uparrow+Fe(NO_3)_3+6H_2O$ $a \frac{a}{3} \frac{a}{3}$
$3Cu_2S+16HNO_3\rightarrow 3CuSO_4+3Cu(NO_3)_2+8H_2O+10NO\uparrow$
$a a a$
$........ ......................................................$
$\Rightarrow A_1:\begin{cases}Fe(OH)_3:a mol \\Cu(OH)_2:2a mol\\BaSO_4:2a mol \end{cases}\Rightarrow A_2:\begin{cases}Fe_2O_3:0,5a mol\\CuO:2a mol\\BaSO_4:2a mol \end{cases}$