Sơ đồ:
\(24,5g\left(A\right)\left\{{}\begin{matrix}Fe\\Cu\\Ag\end{matrix}\right.\xrightarrow[1,6M]{+HNO_3}\left(B\right)\left\{{}\begin{matrix}Fe^{3+}\\Cu^{2+}\\Ag^+\\NO_3^-\end{matrix}\right.+NO:6,372l\)
\(n_{NO}=\dfrac{6,272}{22,4}=0,28mol\\ BTe:3n_{Fe}+2n_{Cu}+n_{Ag}=3n_{NO}=3.0,28=0,84mol\\ m=24,5+0,84.62=76,58g\)
\(BTNT\left(N\right):n_{HNO_3}=n_{NO_3^-}+n_{NO}\\ \Leftrightarrow n_{HNO_3}=0,84+0,28\\ \Leftrightarrow n_{HNO_3}=1,12mol\\ \\ V=V_{HNO_3}=\dfrac{1,12}{1,6}=0,7l=700ml\)