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\(n_{Br_2}=\dfrac{8}{160}=0,05mol\)
\(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
0,05 0,05 ( mol )
\(m_{C_2H_4}=0,05.28=1,4g\)
=> Chọn C
1. \(n_{Br_2}=0,4.0,5=0,2\left(mol\right)\)
PT: \(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
Theo PT: \(n_{C_2H_4}=n_{Br_2}=0,2\left(mol\right)\Rightarrow V_{C_2H_4}=0,2.22,4=4,48\left(l\right)\)
2. \(n_{C_2H_4Br_2}=\dfrac{9,4}{188}=0,05\left(mol\right)\)
PT: \(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
Theo PT: \(n_{C_2H_4}=n_{C_2H_4Br_2}=0,05\left(mol\right)\)
\(\Rightarrow\%V_{C_2H_4}=\dfrac{0,05.22,4}{1,4}.100\%=80\%\)
\(\Rightarrow\%V_{CH_4}=100-80=20\%\)
a)
\(n_{Br_2}=\dfrac{8}{160}=0,05\left(mol\right)\)
PTHH: C2H4 + Br2 --> C2H4Br2
0,05<-0,05
=> \(n_{CH_4}=\dfrac{3,36}{22,4}-0,05=0,1\left(mol\right)\)
\(\%m_{CH_4}=\dfrac{0,1.16}{0,1.16+0,05.28}.100\%=53,33\%\)
\(\%m_{C_2H_4}=\dfrac{0,05.28}{0,1.16+0,05.28}.100\%=46,67\%\)
b)
PTHH: CH4 + 2O2 --to--> CO2 + 2H2O
0,1-->0,2
C2H4 + 3O2 --to--> 2CO2 + 2H2O
0,05--->0,15
=> \(V_{O_2}=\left(0,2+0,15\right).22,4=7,84\left(l\right)\)
a, PT: \(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
b, Ta có: \(n_{C_2H_4Br_2}=\dfrac{9,4}{188}=0,05\left(mol\right)\)
Theo PT: \(n_{C_2H_4}=n_{C_2H_4Br_2}=0,08\left(mol\right)\)
\(\Rightarrow V_{C_2H_4}=0,08.22,4=1,792\left(l\right)\)
c, Theo PT: \(n_{Br_2}=n_{C_2H_4Br_2}=0,08\left(mol\right)\)
\(\Rightarrow m_{Br_2}=0,08.160=12,8\left(g\right)\)
\(\Rightarrow m_{ddBr_2}=\dfrac{12,8}{8\%}=160\left(g\right)\)
a)
C2H4 + Br2 --> C2H4Br2
C2H2 + 2Br2 --> C2H2Br4
b)
Gọi \(\left\{{}\begin{matrix}n_{C_2H_4}=a\left(mol\right)\\n_{C_2H_2}=b\left(mol\right)\end{matrix}\right.\) => \(a+b=\dfrac{13,44}{22,4}=0,6\) (1)
PTHH: C2H4 + Br2 --> C2H4Br2
a--->a
C2H2 + 2Br2 --> C2H2Br4
b--->2b
=> \(a+2b=0,8.1=0,8\) (2)
(1)(2) => a = 0,4 (mol); b = 0,2 (mol)
PTHH: C2H4 + 3O2 --to--> 2CO2 + 2H2O
0,4--->1,2
2C2H2 + 5O2 --to--> 4CO2 + 2H2O
0,2---->0,5
=> \(V_{O_2}=\left(1,2+0,5\right).22,4=38,08\left(l\right)\)
=> Vkk = 38,08 : 20% = 190,4 (l)
a, \(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
\(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)
b, Ta có: \(n_{C_2H_4}+n_{C_2H_2}=\dfrac{0,56}{22,4}=0,025\left(mol\right)\) (1)
Theo PT: \(n_{Br_2}=n_{C_2H_4}+2n_{C_2H_2}=\dfrac{5,6}{160}=0,035\left(mol\right)\) (2)
Từ (1) và (2) \(\Rightarrow\left\{{}\begin{matrix}n_{C_2H_4}=0,015\left(mol\right)\\n_{C_2H_2}=0,01\left(mol\right)\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}m_{C_2H_4}=0,015.28=0,42\left(g\right)\\m_{C_2H_2}=0,01.26=0,26\left(g\right)\end{matrix}\right.\)
c, \(CaC_2+2H_2O\rightarrow Ca\left(OH\right)_2+C_2H_2\)
Theo PT: \(n_{CaC_2}=n_{C_2H_2}=0,01\left(mol\right)\Rightarrow m_{CaC_2}=0,01.64=0,64\left(g\right)\)
Ta có: \(n_{Br_2}=\dfrac{8}{160}=0,05\left(mol\right)\)
PT: \(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
\(n_{C_2H_4}=n_{Br_2}=0,05\left(mol\right)\Rightarrow m_{C_2H_4}=0,05.28=1,4\left(g\right)\)
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