Câu hỏi 15

\(\begin{gathered}
5,1(g)\left\{ \begin{gathered}
Al \hfill \\
Mg \hfill \\
\end{gathered} \right. + \left\{ \begin{gathered}
AgN{O_3}:3k \hfill \\
Cu{(N{O_3})_2}:4k \hfill \\
\end{gathered} \right. \to 29,68(g)\,ran\,Y\left\{ \begin{gathered}
Ag:x \hfill \\
Cu:y \hfill \\
\end{gathered} \right\} + dd\,X\left\{ \begin{gathered}
M{g^{2 + }} \hfill \\
A{l^{3 + }} \hfill \\
C{u^{2 + }}\,du \hfill \\
N{O_3}^ - \hfill \\
\end{gathered} \right\} \hfill \\
29,68(g)ran\,Y\left\{ \begin{gathered}
Ag:x \hfill \\
Cu:y \hfill \\
\end{gathered} \right.\xrightarrow{{ + HN{O_3}dac,\,du}}N{O_2}:0,5 \to \left\{ \begin{gathered}
108x + 64y = 29,68 \hfill \\
x + 2y = 0,5(BTe) \hfill \\
\end{gathered} \right. \to \left\{ \begin{gathered}
x = 0,18 \to k = 0,06 \hfill \\
y = 0,16 \hfill \\
\end{gathered} \right. \hfill \\
G/s\left\{ \begin{gathered}
Al:u \hfill \\
Mg:v \hfill \\
\end{gathered} \right. \to \left\{ \begin{gathered}
27u + 24v = 5,1 \hfill \\
\xrightarrow{{BTe:3{n_{Al}} + 2{n_{Mg}} = {n_{Ag}} + 2{n_{Cu}}}}3u + 2v = 0,18 + 2.0,16 \hfill \\
\end{gathered} \right. \to \left\{ \begin{gathered}
u = 0,1 \hfill \\
v = 0,1 \hfill \\
\end{gathered} \right. \hfill \\
\to X\left\{ \begin{gathered}
A{l^{3 + }}:0,1 \hfill \\
M{g^{2 + }}:0,1 \hfill \\
C{u^{2 + }}du:4k - y = 0,08 \hfill \\
\end{gathered} \right. \hfill \\
\to m = {m_{Mg{{({\text{OH)}}}_{\text{2}}}}}{\text{ + }}{{\text{m}}_{{\text{Cu(OH}}{{\text{)}}_{\text{2}}}}}{\text{ = 0,1}}{\text{.58 + 0,08}}{\text{.98 = 13,64(g)}} \hfill \\
\end{gathered} \)

Đáp án A