$a)$ $n_{NaCl}$ = $0,1.1,2$ = $0,12$ (mol)
$ $m_{NaCl}$ = $0,12.58,5$ = $7,02$ (g)
$b)$ $n_{CuSO4}$ = $0,25.0,8$ = $0,2$ (mol)
$m_{CuSO4}$ = $160.0,2$ = 32(g)
$c)$ $n_{Mg(NO3)2}$ = $0,3.0,9$ = $0,27$ (mol)
$m_{Mg(NO3)2}$ = $148.0,27$ = $39,96$ (g)
$d)$ $m_{FeSO4}$ = $\frac{200.15,2}{100}$ = 30,4(g)
$n_{FeSO4}$ = $\frac{30,4}{152}$ = $0,2$ (mol)
$e)$ $m_{K3PO4}$ = $\frac{350.15,9}{100}$ = $55,65$ (g)
$n_{K3PO4}$ = $\frac{55,65}{212}$ = $0,2625$ (mol)
$f)$ $m_{ZnCl2}$ = $\frac{80.20,4}{100}$ = $16,32$ (g)
$n_{ZnCl2}$ = $\frac{16,32}{136}$ = $0,12$ (mol)
$g)$ $m_{Ba(OH)2}$ = $\frac{142,5.42}{100}$ = $59,85$ (g)
$n_{Ba(OH)2}$ = $\frac{59,85}{171}$ = $0,35$ (mol)
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