bài 3
a,
ZnO + 2HCl → Zn$Cl_{2}$ +$H_{2}$O
b,
$n_{HCl}$= 0.1 x 2 = 0.2 mol
⇒ $n_{ZnO}$ = $\frac{1}{2}$$n_{HCl}$ = 0.1 mol
⇒$m_{ZnO}$ = 0.1 x ( 65 + 16 ) =8.1 g
c,
$n_{ZnCl2}$ = $\frac{1}{2}$$n_{HCl}$ = 0.1 mol
⇒$m_{ZnCl2}$ = 0.1 x (65+35.5x2)=13.6g
bài 4.
a, CaO + C$O_{2}$ → $CaCO_{3}$
b,$Na_{2}$O + $H_{2}$O → 2NaOH
c, $Fe_{2}$$O_{3}$ + 6HCl → 2Fe$Cl_{3}$ + 3$H_{2}$O
d, P2O5 + 3H2O → 2H3PO4
e, Ca(OH)2+SO2⟶H2O+CaSO3
