PT: \(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)

\(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)

Ta có: \(n_{C_2H_4}+n_{C_2H_2}=\dfrac{0,56}{22,4}=0,025\left(mol\right)\left(1\right)\)

Theo PT: \(n_{Br_2}=n_{C_2H_4}+n_{C_2H_2}=\dfrac{6,4}{160}=0,04\left(mol\right)\left(2\right)\)

Từ (1) và (2) \(\Rightarrow\left\{{}\begin{matrix}n_{C_2H_4}=0,01\left(mol\right)\\n_{C_2H_2}=0,015\left(mol\right)\end{matrix}\right.\)

\(\Rightarrow\left\{{}\begin{matrix}\%V_{C_2H_4}=\dfrac{0,01.22,4}{0,56}.100\%=40\%\\\%V_{C_2H_2}=60\%\end{matrix}\right.\)

a) + b) Gọi số mol của C2H4 và C2H2 lần lượt là x và y mol
theo bài ra: x+y = 0,56/22,4 = 0,025 (mol) (1)
Pt:
C2H4 + Br2 → C2H4Br2
x mol x mol x mol
C2H2 + 2 Br2 → C2H2Br4
y mol 2y mol y mol
Số mol n Br2 = x+2y = 5,6/160 = 0,035 9mol) (2)
Giải hệ (1) và (2) ta đc: x = 0,015 và y = 0,01
=> %V C2H4 = 0,015/0,025 = 60% ; %V C2H2 = 40%
(%V = % số mol ở cùng điều kiện)

\(n_{hh}=\dfrac{0,56}{22,4}=0,025mol\)

\(n_{Br_2}=\dfrac{5,6}{160}=0,035mol\)

Gọi \(\left\{{}\begin{matrix}n_{C_2H_4}=x\\n_{C_2H_2}=y\end{matrix}\right.\)

\(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)

  x           x                            ( mol )

\(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)

  y           2y                               ( mol )

\(\left\{{}\begin{matrix}x+y=0,025\\x+2y=0,035\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}x=0,015\\y=0,01\end{matrix}\right.\)

\(\%V_{C_2H_4}=\dfrac{0,015}{0,025}.100=60\%\)

\(\%V_{C_2H_2}=100-60\%=40\%\)

\(\left\{{}\begin{matrix}C_2H_4:x\left(mol\right)\\C_2H_2:y\left(mol\right)\end{matrix}\right.\)⇒ x + y = \(\dfrac{6,72}{22,4}=0,3\left(1\right)\)

\(C_2H_4 + Br_2 \to C_2H_4Br_2\\ C_2H_2 + 2Br_2 \to C_2H_2Br_4\)

Theo PTHH : 

x + 2y = \(\dfrac{64}{160} = 0,4(2)\)

Từ (1)(2) suy ra: x = 0,2 ; y = 0,1

Vậy :

\(\%V_{C_2H_4} = \dfrac{0,2}{0,3}.100\% = 66,67\%\\ \%V_{C_2H_2} = 100\% - 66,67\% = 33,33\%\)

\(n_{CO_2}=0.3\left(mol\right)\)

\(Đặt:n_{C_2H_2}=a\left(mol\right),n_{C_2H_4}=b\left(mol\right)\)

\(n_{Br_2}=\dfrac{64}{160}=0.4\left(mol\right)\)

\(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)

\(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)

\(\left\{{}\begin{matrix}a+b=0.3\\2a+b=0.4\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}a=0.1\\b=0.2\end{matrix}\right.\)

\(\%V_{C_2H_2}=\dfrac{0.1}{0.3}\cdot100\%=33.33\%\)

\(\%V_{C_2H_4}=66.67\%\)

\(Gọi : n_{C_2H_4} = a; n_{C_2H_2} = b\\ \Rightarrow a + b = \dfrac{5,6}{22,4} = 0,25(1)\\ C_2H_4 + Br_2 \to C_2H_4Br_2\\ C_2H_2 + 2Br_2 \to C_2H_2Br_4\\ n_{Br_2} = a + 2b = \dfrac{56}{160} =0,35(2)\\ (1)(2)\Rightarrow a = 0,15 ; b = 0,1\\ \Rightarrow \%V_{C_2H_4} = \dfrac{0,15}{0,25} .100\% = 60\%\\ \%V_{C_2H_2} = 100\% -60\% = 40\%\)

giups mình với

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: \(n_{CaC_2}=n_{C_2H_2}=0,01\left(mol\right)\Rightarrow m_{CaC_2}=0,01.64=0,64\left(g\right)\)

\(5gX\left\{{}\begin{matrix}CH_4:a\left(mol\right)\\C_2H_4:b\left(mol\right)\\C_2H_2:c\left(mol\right)\end{matrix}\right.\)

Cho X tác dụng với dung dịch \(AgNO_3\)/\(NH_3\) chỉ có \(C_2H_2\) phản ứng.

\(n_{\downarrow}=n_{C_2Ag_2}=\dfrac{24}{240}=0,1mol\)

\(C_2H_2+2AgNO_3+2NH_3\rightarrow C_2Ag_2\downarrow+2NH_4NO_3\)

0,1                                            0,1

\(\Rightarrow c=0,1mol\)

\(\Rightarrow16a+28b=5-0,1\cdot26=2,4\left(1\right)\)

Cho X tác dụng với brom:

\(n_{Br_2}=\dfrac{28}{160}=0,175mol\)

\(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)

\(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)

\(\Rightarrow b+2c=0,175\Rightarrow b=0,175-2\cdot0,1=-0,025\left(âm\right)???\)

a) 

\(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)

\(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)

b) 

Gọi số mol C₂H₂, C₂H₄ là a, b

=> \(a+b=\dfrac{2,24}{22,4}=0,1\left(mol\right)\)

\(n_{Br_2}=\dfrac{22,4}{160}=0,14\left(mol\right)\)

PTHH:\(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)

              a---->2a

          \(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)

              b--->b

=> 2a + b = 0,14

=> a = 0,04; b = 0,06

\(\left\{{}\begin{matrix}\%V_{C_2H_2}=\dfrac{0,04}{0,1}.100\%=40\%\\\%V_{C_2H_4}=\dfrac{0,06}{0,1}.100\%=60\%\end{matrix}\right.\)