\(a)n_{Ag} = \dfrac{21,6}{108} = 0,2(mol)\\ CH_3CHO + 2AgNO_3 + 3NH_3 + H_2O \to CH_3COONH_4 + 2Ag + 2NH_4NO_3\\ n_{CH_3CHO} = \dfrac{1}{2}n_{Ag} = 0,1(mol)\\ \Rightarrow C\%_{CH_3CHO} = \dfrac{0,1.44}{50}.100\% = 8,8\%\\ b) CH_3CHO + H_2 \xrightarrow{t^o,xt} CH_3CH_2OH\\ n_{CH_3CH_2OH} = n_{CH_3CHO} = 0,1(mol)\\ \Rightarrow m_{CH_3CH_2OH} = 0,1.46 = 4,6(gam)\)
a)nAg = 0,2 mol
CH3CHO + 2AgNO3 + 3NH3 + H2O → CH3COONH4 + 2NH4NO3 + 2Ag
0,1.......................................................................................................0,2
→mCH3CHO = 0,1. 44 = 4,4 g
→%CH3CHO = \(\dfrac{4,4}{5}\) .100% = 88%
b) CH3CHO + H2 → C2H5OH