Em tham khảo nha:
\(\begin{array}{l}
1)\\
a)\,MgO + {H_2}S{O_4} \to MgS{O_4} + {H_2}O\\
b)\,{N_2}{O_5} + {H_2}O \to 2HN{O_3}\\
c)\,N{a_2}S{O_3} + {H_2}S{O_4} \to N{a_2}S{O_4} + S{O_2} + {H_2}O\\
d)\,F{e_2}{O_3} + 6HCl \to 2FeC{l_3} + 3{H_2}O\\
3)\\
a)\\
Zn + 2HCl \to ZnC{l_2} + {H_2}\\
{n_{Zn}} = \dfrac{{19,5}}{{65}} = 0,3\,mol\\
{n_{ZnC{l_2}}} = {n_{Zn}} = 0,3\,mol\\
{C_M}ZnC{l_2} = \dfrac{{0,3}}{{0,2}} = 1,5M\\
b)\\
{n_{{H_2}}} = {n_{Zn}} = 0,3\,mol\\
{V_{{H_2}}} = 0,3 \times 22,4 = 6,72l\\
c)\\
NaOH + HCl \to NaCl + {H_2}O\\
{n_{HCl}} = 2{n_{Zn}} = 0,6\,mol\\
{n_{NaOH}} = {n_{HCl}} = 0,6\,mol\\
{m_{{\rm{dd}}NaOH}} = \dfrac{{0,6 \times 40}}{{20\% }} = 120g
\end{array}\)
