Nhiệt phân hoàn toàn hỗn hợp X gồ...

C

- Hướng dẫn giải

\(X\left\{ \begin{array}{l}
K\mathop N\limits^{ + 5} {O_3}:\,a\,mol\\
\mathop {Fe}\limits^{ + 2} (\mathop {\mathop N\limits^{ + 5} {O_3}{)_2}:\,b\,mol}\limits^{} 
\end{array} \right. \to \left\{ \begin{array}{l}
K\mathop {\mathop N\limits^{ + 3} {O_2}}\limits^{} ,\;{\mathop {Fe}\limits^{ + 3} _2}{O_3}\\
N{O_2} + {O_2} \to H\mathop N\limits^{ + 5} {O_3}
\end{array} \right. \to \left\{ \begin{array}{l}
K\mathop N\limits^{ + 5} {O_3} + 2e \to K\mathop N\limits^{ + 3} {O_2}\\
\mathop {Fe}\limits^{ + 2} {(N{O_3})_2} \to {\mathop {Fe}\limits^{ + 3} _2}{O_3} + 1e
\end{array} \right.\,\,\)

\( \to \frac{{{m_X}}}{{{M_X}}}.n = 2{n_{{H_2}}} = 0,9\)

\({n_{Fe{{(N{O_3})}_2}}} = 2{n_{KN{O_3}}}\,\, \to b = 2a\)