Giải thích các bước giải:
14,
\(\begin{array}{l}
2{N_2} + 5{O_2} \to 2{N_2}{O_5}\\
K + {H_2}O \to KOH + \dfrac{1}{2}{H_2}\\
{N_2}{O_5} + {H_2}O \to 2HN{O_3}\\
N{a_2}O + {H_2}O \to 2NaOH\\
Fe + 2HCl \to FeC{l_2} + {H_2}
\end{array}\)
15,
\(\begin{array}{l}
Zn + {H_2}S{O_4} \to ZnS{O_4} + {H_2}\\
{n_{Zn}} = 0,05mol\\
\to {n_{ZnS{O_4}}} = {n_{Zn}} = 0,05mol \to {m_{ZnS{O_4}}} = 8,05g\\
\to {n_{{H_2}}} = {n_{Zn}} = 0,05mol \to {V_{{H_2}}} = 1,12l\\
CuO + {H_2} \to Cu + {H_2}O\\
{n_{CuO}} = {n_{{H_2}}} = {n_{Zn}} = 0,05mol\\
\to {m_{CuO}} = 4g
\end{array}\)
