Em tham khảo nha :
\(\begin{array}{l}
2)\\
a)\\
2Ca + {O_2} \to 2CaO\\
b)\\
CaO + {H_2}O \to Ca{(OH)_2}\\
c)\\
Ca{(OH)_2} + C{O_2} \to CaC{O_3} + {H_2}O\\
d)\\
F{e_2}{O_3} + 3{H_2} \to 2Fe + 3{H_2}O\\
3)\\
a)\\
Zn + 2HCl \to ZnC{l_2} + {H_2}\\
b)\\
{n_{Zn}} = \dfrac{{13}}{{65}} = 0,2mol\\
{n_{HCl}} = 2{n_{Zn}} = 0,4mol\\
{C_{{M_{HCl}}}} = \dfrac{{0,4}}{{0,2}} = 2M\\
c)\\
{H_2} + CuO \to Cu + {H_2}O\\
{n_{{H_2}}} = {n_{Zn}} = 0,2mol\\
{n_{CuO}} = \dfrac{{20}}{{80}} = 0,25mol\\
\dfrac{{0,2}}{1} < \dfrac{{0,25}}{1} \to CuO\text{ dư}\\
{n_{Cu}} = {n_{{H_2}}} = 0,2mol\\
{m_{Cu}} = 0,2 \times 64 = 12,8g
\end{array}\)
