\(n_{Fe}=\frac{7,28}{56}=0,13\left(mol\right)\)
\(n_{AgNO3}=0,15.2=0,26\left(mol\right)\)
\(Fe+2Ag^+\rightarrow Fe^{2+}+2Ag\)
0,13__0.26______0,13___0,26
\(Fe^{2+}+Ag^+\rightarrow Fe^{3+}+Ag\)
0,04____0,04_____0,04___0,04
Dd spu gồm
\(Fe^{2+}\left(0,1-0,04=0,09mol\right)\)
\(Fe^{3+}\left(0,04mol\right)\)
\(NO^{3-}\left(0,3\right)\)
\(\Rightarrow m_{Fe^{2+}}+m_{Fe^{3+}}+m_{NO^{3-}}=25,88\left(g\right)\)