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a)
$n_{Br_2} = \dfrac{160.15\%}{160} = 0,15(mol)$
$C_2H_4 + Br_2 \to C_2H_4Br_2$
Ta thấy : $n_{C_2H_4} = 0,2 > n_{Br_2} = 0,15$ nên $C_2H_4$ dư
$n_{C_2H_4Br_2} = n_{Br_2} = 0,15(mol) \Rightarrow m_{C_2H_4Br_2} = 0,15.188 = 28,2(gam)$
b) $n_{C_2H_4\ dư} = 0,2 - 0,15 = 0,05(mol) \Rightarrow V_{C_2H_4} = 0,05.22,4 = 1,12(lít)$
$C_2H_4 + 3O_2 \xrightarrow{t^o} 2CO_2 + 2H_2O$
Theo PTHH :
$V_{CO_2} =2 V_{C_2H_4} = 2,24(lít)$
$V_{O_2} = 3V_{C_2H_4} = 3,36(lít) \Rightarrow V_{kk} = 5V_{O_2} = 16,8(lít)$
PT: \(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
\(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)
Ta có: \(n_{C_2H_4}+n_{C_2H_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\left(1\right)\)
Theo PT: \(n_{Br_2}=n_{C_2H_4}+2n_{C_2H_2}=\dfrac{8}{160}=0,05\left(mol\right)\) (2)
Từ (1) và (2) \(\Rightarrow\left\{{}\begin{matrix}n_{C_2H_4}=0,55\\n_{C_2H_2}=-0,25\end{matrix}\right.\)
Đến đây thì ra số mol âm, bạn xem lại đề nhé.
C2H2+2Br2->C2H2Br4
x-----------2x
C2H4+Br2->C2H4Br2
y-----------2y
n Br2=0,8 mol
\(\left\{{}\begin{matrix}x+y=0,6\\2x+y=0,8\end{matrix}\right.\)
=>x=0,2 ,y=0,4 mol
=>%VC2H2=\(\dfrac{0,2.22,4}{13,44}100\)=33,33%
=>%C2H4=66,67%
C2H4+3O2-tO>2CO2+2H2O
C2H2+5\2O2-to>2CO2+H2O
=>Vkk=1,7.22,4.5=190,4l
a) \(n_{Br_2\left(p\text{ư}\right)}=\dfrac{6,4}{160}=0,04\left(mol\right);n_{hh}=\dfrac{13,44}{22,4}=0,6\left(mol\right)\)
PTHH: \(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
0,04<--0,04
\(\Rightarrow\left\{{}\begin{matrix}\%V_{C_2H_4}=\dfrac{0,04}{0,6}.100\%=6,67\%\\\%V_{CH_4}=100\%-6,67\%=93,33\%\end{matrix}\right.\)
b) \(n_{CH_4}=0,6-0,04=0,56\left(mol\right)\)
PTHH: \(CH_4+2O_2\xrightarrow[]{t^o}CO_2+2H_2O\)
0,56----------->0,56
\(C_2H_4+3O_2\xrightarrow[]{t^o}2CO_2+2H_2O\)
0,04----------->0,08
\(\Rightarrow V_{CO_2}=\left(0,08+0,56\right).22,4=14,336\left(l\right)\)
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)
\(a) C_2H_4 + Br_2 \to C_2H_4Br_2\\ C_2H_2 + 2Br_2 \to C_2H_2Br_4\\ b) n_{C_2H_4} = a(mol) ; n_{C_2H_2} = b(mol)\\ n_X = a + b = \dfrac{0,56}{22,4} = 0,025(mol)\\ n_{Br_2} = a + 2b = \dfrac{5,6}{160} =0,035(mol)\\ \Rightarrow a = 0,015 ; b = 0,01\\ \%V_{C_2H_4} = \dfrac{0,015}{0,025}.100\% = 60\%\\ \%V_{C_2H_2} = 100\% -60\% = 40\%\)
\(c) C_2H_4 + 3O_2 \xrightarrow{t^o} 2CO_2 + 2H_2O\\ 2C_2H_2 + 5O_2 \xrightarrow{t^o} 4CO_2 + 2H_2O\\ n_{O_2} = 3n_{C_2H_4} + \dfrac{5}{2}n_{C_2H_2} = 0,07(mol)\\ V_{O_2} = 0,07.22,4 = 1,568(lít)\)
a) \(n_{Br_2}=0,1.2=0,2\left(mol\right)\)
PTHH: \(CH_2=CH_2+Br_2\rightarrow CH_2Br-CH_2Br\)
0,2<-------0,2
\(\Rightarrow V_{C_2H_4}=0,2.22,4=4,48\left(l\right)\)
b) PTHH: \(CH\equiv CH+2Br_2\rightarrow CHBr_2-CHBr_2\)
0,1<--------0,2
\(\Rightarrow n_{C_2H_4}-n_{C_2H_2}=0,1\left(mol\right)\)