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\(a)n_{Ag} = \dfrac{21,6}{108} = 0,2(mol)\\ CH_3CHO + 2AgNO_3 + 3NH_3 + H_2O \to CH_3COONH_4 + 2Ag + 2NH_4NO_3\\ n_{CH_3CHO} = \dfrac{1}{2}n_{Ag} = 0,1(mol)\\ \Rightarrow C\%_{CH_3CHO} = \dfrac{0,1.44}{50}.100\% = 8,8\%\\ b) CH_3CHO + H_2 \xrightarrow{t^o,xt} CH_3CH_2OH\\ n_{CH_3CH_2OH} = n_{CH_3CHO} = 0,1(mol)\\ \Rightarrow m_{CH_3CH_2OH} = 0,1.46 = 4,6(gam)\)
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
Câu 19:
\(n_{Ag}=\dfrac{12,96}{108}=0,12\left(mol\right)\)
PT: \(CH_3CHO+2AgNO_3+3NH_3\underrightarrow{t^o}CH_3COONH_4+2Ag+2NH_4NO_3\)
Theo PT: \(n_{CH_3CHO}=\dfrac{1}{2}n_{Ag}=0,06\left(mol\right)\)
\(\Rightarrow C\%_{CH_3CHO}=\dfrac{0,06.44}{32}.100\%=8,25\%\)
Đáp án: C
CH3CHO + 2AgNO3 + 3NH3 + H2O → CH3COONH4 + 2Ag↓ + 2NH4NO3 (1)
CH3COOH + NaOH → CH3COONa + H2O (2)
Theo (1):
\(1,n_{CH_3CHO}=\dfrac{5,28}{44}=0,12\left(mol\right)\)
PTHH:
4AgNO3 + 3CH3CHO + 5NH3 ---> 4Ag↓ + 3NH4NO3 + 3CH3COONH4
0,12--------------->0,16
\(\rightarrow m_{Ag}=0,16.108=17,28\left(g\right)\)
\(2,n_{Ag}=\dfrac{16,2}{108}=0,15\left(mol\right)\)
PTHH:
3C2H5OH + 4AgNO3 + 5NH3 ---> 4Ag↓ + 3NH4NO3 + 3CH3COONH4
0,1125<---------------------------------0,15
\(\rightarrow m=0,1125.46=5,175\left(g\right)\)
CH3CHO + 2AgNO3 + 3NH3 + H2O → CH3COONH4 + 2Ag↓ + 2NH4NO3 (1)
CH3COOH + NaOH → CH3COONa + H2O (2)
Hướng dẫn giải
n A g = 0 , 1 m o l → n H C H O = n A g 4 = 0 , 025 m o l → m H C H O = 0 , 75 g a m → C % H C H O = 0 , 75 1 , 97 = 38 , 07 %
Chọn D
\(n_{H_2}=\dfrac{2.24}{22.4}=0.1\left(mol\right)\)
\(C_2H_5OH+Na\rightarrow C_2H_5ONa+\dfrac{1}{2}H_2\)
\(0.2..................................................0.1\)
\(n_{Ag}=\dfrac{21.6}{108}=0.2\left(mol\right)\)
\(CH_3CHO+2AgNO_3+3NH_3+H_2O\rightarrow CH_3COONH_4+2Ag+2NH_4NO_3\)
\(0.1........................................................................................0.2\)
\(n_X=0.2+0.1=0.3\left(mol\right)\)
\(\%n_{C_2H_5OH}=\dfrac{0.2}{0.3}\cdot100\%=66.67\%\)
\(\%n_{CH_3CHO}=33.33\%\)
CH3CHO + 2AgNO3 + 3NH3 + H2O → CH3COONH4 + 2Ag↓ + 2NH4NO3
Từ phương trình ta có: