1)
$3AgNO_3 + AlCl_3 \to Al(NO_3)_3 + 3AgCl$
$K_2SO_4 + BaCl_2 \to BaSO_4 + 2KCl$
$6KOH + Al_2(SO_4)_3 \to 2Al(OH)_3 + 3KCl$
$Na_2CO_3 + 2HCl \to 2NaCl + CO_2 + H_2O$
2_
$CuCl_2 + 2NaOH \to Cu(OH)_2 + 2NaCl$
Theo PTHH :
$n_{CuCl_2} = n_{Cu(OH)_2} = \dfrac{1}{2}n_{NaOH} = \dfrac{1}{2}.\dfrac{200.20\%}{40} = 0,25(mol)$
$m_{CuCl_2} = 0,25.135 = 33,75(gam)$
$m_{Cu(OH)_2} = 0,25.98 = 24,5(gam)$