a, nC2H4Br2 = 28,2/188 = 0,15 (mol)
PTHH: C2H4 + Br2 -> C2H4Br2
Mol: 0,15 <--- 0,15 <--- 0,15
mC2H4 = 0,15 . 28 = 4,2 (g)
%mC2H4 = 4,2/9 = 46,67%
%mCH4 = 100% - 46,67% = 53,33%
b, VddBr2 = 0,15/0,5 = 0,3 (l)
c, PTHH: C2H4 + H2O -> (H2SO4 đặc) C2H5OH
Mol: 0,15 ---> 0,15 ---> 0,15
nC2H5OH (TT) = 0,15 . 85% = 0,1275 (mol)
mC2H5OH (TT) = 0,1275 . 46 = 5,865 (g)
Cho hỗn hợp tác dụng với dung dịch Brom thu được sản phẩm là \(C_2H_4Br_2\).
\(n_{C_2H_4Br_2}=\dfrac{28,2}{188}=0,15mol\)
\(\Rightarrow n_{etilen}=0,15mol\)
\(\Rightarrow n_{metan}=\dfrac{9-0,15\cdot28}{16}=0,3mol\)
a)\(\%m_{CH_4}=\dfrac{0,3\cdot16}{9}\cdot100\%=53,33\%\)
\(\%m_{C_2H_4}=100\%-53,33\%=46,67\%\)
b)\(n_{Br_2}=n_{etilen}=0,15mol\)
\(\Rightarrow V_{ddBr_2}=\dfrac{n_{Br_2}}{C_{M_{Br_2}}}=\dfrac{0,15}{0,5}=0,3l\)
c)\(C_2H_4+H_2O\underrightarrow{xtH_2SO_4}C_2H_5OH\)
0,15 0,15
\(H=85\%\Rightarrow n_{etilen}=85\%\cdot0,15=0,1275mol\)
\(\Rightarrow n_{C_2H_5OH}=n_{C_2H_4}=0,1275mol\)
\(\Rightarrow m_{C_2H_5OH}=0,1275\cdot46=5,865g\)