Phương pháp giải:

Lời giải chi tiết:

\(\begin{gathered}
FeC{O_3}{\text{ }} \to {\text{ }}Fe{\left( {N{O_3}} \right)_3} \hfill \\
0,1{\text{ }}mol{\text{ }} \to {\text{ }}0,1{\text{ }}mol \hfill \\
\to \left\{ \begin{gathered}
F{e^{3 + }}:0,1mol \hfill \\
N{O_3}^ - :0,3 \hfill \\
{H^ + } \hfill \\
\end{gathered} \right. \hfill \\
2F{e^{3 + }} + C{u^{2 + }} \to 2F{e^{2 + }} + C{u^{2 + }} \hfill \\
0,1 \to 0,05 \hfill \\
3Cu + 8{H^ + } + 2N{O_3}^ - \to 3C{u^{2 + }} + 2NO + 4{H_2}O \hfill \\
0,45\,\,\,\,\,\,\,\,\,\, \leftarrow \,\,\,0,3 \hfill \\
\to {n_{Cu}} = 0,05 + 0,45 = 0,5mol \to {m_{Cu}} = 32gam \hfill \\
\end{gathered} \)

Đáp án D