\(V_{C2H5OH}=12,5.92\%=11,5\left(ml\right)\)
\(\rightarrow m_{C2H5OH}=11,5.0,8=9,2\left(g\right)\rightarrow n_{C2H5OH}=\frac{9,2}{46}=0,2\left(mol\right)\)
\(C_2H_5OH+CuO\underrightarrow{^{to}}CH_3CHO+Cu+H_2O\)
\(\rightarrow n_{CH3CHO}=n_{C2H5OH}=0,2\left(mol\right)\)
\(CH_3CHO+2AgNO_3+2NH_3+H_2O\rightarrow CH_2COPNH_4+2Ag+2NH_4NO_3\)
\(\rightarrow n_{Ag}=2n_{CH3CHO}=0,4\left(mol\right)\)
\(\rightarrow m_{Ag}=0,4.108=43,2\left(g\right)\)