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ta có :
nBr2=\(\dfrac{16}{160}=0,1mol\)
C2H4+Br2->C2H4Br2
0,1------0,1
=>VC2H4=0,1.22,4=2,24l
=>VCH4=3,36l->n CH4=0,15 mol
->%VC2H4=\(\dfrac{2,24}{5,6}.100\)=40%
=>%VCH4=60%
c)
CH4+2O2-to>CO2+2H2O
0,15---------------0,15
C2H4+3O2--to>2CO2+2H2O
0,1--------------------0,2
=>m CaCO3=0,35.100=35g
a) PTHH: \(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
Ta có: \(n_{C_2H_4}=\dfrac{5,6}{28}=0,2\left(mol\right)=n_{C_2H_4Br_2}\) \(\Rightarrow m_{C_2H_4Br_2}=0,2\cdot188=37,6\left(g\right)\)
b) Ta có: \(n_{CH_4}=\dfrac{11,2}{22,4}-0,2=0,3\left(mol\right)\)
Bảo toàn nguyên tố: \(n_{CO_2}=n_{CH_4}+2n_{C_2H_4}=0,7\left(mol\right)\)
\(\Rightarrow V_{CO_2}=0,7\cdot22,4=15,68\left(l\right)\)
Ta có: \(V_{hhsaupư}=V_{CH_4}=\dfrac{44,8}{5,6}=8\left(l\right)\)
\(\Rightarrow\left\{{}\begin{matrix}\%V_{CH_4}=\dfrac{8}{44,8}.100\%\approx17,86\%\\\%V_{C_2H_4}\approx82,14\%\end{matrix}\right.\)
sai kìa bn
cái phần số mol của brom phải là 0,03375 chứ bn
a, Ta có: \(n_{CH_4}+n_{C_2H_4}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\left(1\right)\)
\(16n_{CH_4}+28n_{C_2H_4}=3\left(2\right)\)
Từ (1) và (2) \(\Rightarrow\left\{{}\begin{matrix}n_{CH_4}=0,1\left(mol\right)\\n_{C_2H_4}=0,05\left(mol\right)\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}\%m_{CH_4}=\dfrac{0,1.16}{3}.100\%\approx53,33\%\\\%m_{C_2H_4}\approx46,67\%\end{matrix}\right.\)
- Ở cùng điều kiện nhiệt độ và áp suất, % số mol cũng là %V.
\(\Rightarrow\left\{{}\begin{matrix}\%V_{CH_4}=\dfrac{0,1}{0,15}.100\%\approx66,67\%\\\%V_{C_2H_4}\approx33,33\%\end{matrix}\right.\)
b, PT: \(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
Có: m tăng = mC2H4 = 0,05.28 = 1,4 (g)
a) \(n_{hh}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)
Gọi \(\left\{{}\begin{matrix}n_{CH_4}=a\left(mol\right)\\n_{C_2H_4}=b\left(mol\right)\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}a+b=0,15\\16a+28b=3\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}a=0,1\\b=0,05\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}\%V_{CH_4}=\dfrac{0,1}{0,15}.100\%=66,67\%\\\%V_{C_2H_4}=100\%-66,67\%=33,33\%\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}\%m_{CH_4}=\dfrac{0,1.16}{3}.100\%=53,33\%\\\%m_{C_2H_4}=100\%-53,33\%=46,67\%\end{matrix}\right.\)
b) \(m=m_{C_2H_4}=0,05.28=1,4\left(g\right)\)
1) \(\left\{{}\begin{matrix}\%V_{CH_4}=\dfrac{1,68}{6,72}\cdot100\%=25\%\\\%V_{C_2H_2}=75\%\end{matrix}\right.\)
2) Ta có: \(n_{C_2H_4}=\dfrac{5,6}{28}=0,2\left(mol\right)\)
\(\Rightarrow\%V_{C_2H_4}=\dfrac{0,2}{\dfrac{5,6}{22,4}}\cdot100\%=80\%\) \(\Rightarrow\%V_{CH_{_4}}=20\%\)
Ta có: m bình Brom tăng = mC2H4 = 5,6 (g)
\(\Rightarrow n_{C_2H_4}=\dfrac{5,6}{28}=0,2\left(mol\right)\Rightarrow\%V_{C_2H_4}=\dfrac{0,2.22,4}{5,6}.100\%=80\%\)
\(\Rightarrow\%V_{CH_4}=100-80=20\%\)