nC2H4 = 2,24/22,4 = 0,1 (mol)

PTHH: C2H4 + Br2 -> C2H4Br2

Mol: 0,1 ---> 0,1

CMddBr2 = 0,1/0,2 = 0,5M

\(n_{C_2H_4}=\dfrac{V}{22,4}=\dfrac{2,24}{22,4}=0,1mol\)

\(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)

0,1       0,1                               ( mol )

\(C_M=\dfrac{0,1}{0,2}=0,5M\)

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

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: \(n_{C_2H_4}=n_{C_2H_4Br_2}=0,05\left(mol\right)\)

\(\Rightarrow\%V_{C_2H_4}=\dfrac{0,05.22,4}{1,4}.100\%=80\%\)

\(\Rightarrow\%V_{CH_4}=100-80=20\%\)

200ml = 0,2l

\(n_{Zn}=\dfrac{19,5}{65}=0,3\left(mol\right)\)

Pt : \(Zn+2HCl\rightarrow ZnCl_2+H_2|\)

        1         2              1           1

     0,3      0,6             0,3        0,3

a) \(n_{ZnCl2}=\dfrac{0,3.1}{1}=0,3\left(mol\right)\)

\(C_{M_{ZnCl2}}=\dfrac{0,3}{0,2}=1,5\left(M\right)\)

b) \(n_{H2}=\dfrac{0,3.1}{1}=0,3\left(mol\right)\)

\(V_{H2\left(dktc\right)}=0,3.22,4=6,72\left(l\right)\)

c) Pt : \(NaOH+HCl\rightarrow NaCl+H_2O|\)

              1            1              1            1

            0,6          0,6

\(n_{NaOH}=\dfrac{0,6.1}{1}=0,6\left(mol\right)\)

\(m_{NaOH}=0,6.40=24\left(g\right)\)
\(m_{ddNaOH}=\dfrac{24.100}{20}=120\left(g\right)\)

 Chúc bạn học tốt

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

\(\left\{{}\begin{matrix}C_2H_4:x\left(mol\right)\\C_2H_2:y\left(mol\right)\end{matrix}\right.\)⇒ 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 :

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

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

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

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

\(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)

\(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)

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

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

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

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

\(n_{C_2H_2}=\dfrac{0.224}{22.4}=0.01\left(mol\right)\)

\(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)

\(0.01.........0.02........0.01\)

\(m_{C_2H_2Br_4}=0.01\cdot346=3.46\left(g\right)\)

\(V_{dd_{Br_2}}=\dfrac{0.02}{2}=0.01\left(l\right)\)

a) \(C_2H_2 + 2Br_2 \to C_2H_2Br_4\\ \)

\(b)\\ n_{C_2H_2Br_4} = n_{C_2H_2} =\dfrac{0,224}{22,4} = 0,01(mol)\\ \Rightarrow m_{C_2H_2Br_4} = 0,01.346 = 3,46\ gam\\ c)\\ n_{Br_2} = 2n_{C_2H_2} = 0,02(mol)\\ \Rightarrow V_{dd\ brom} =\dfrac{0,02}{2} = 0,01(lít)\)

Theo gt ta có: $n_{C_2H_2}=0,01(mol)$

a, $C_2H_2+2Br_2\rightarrow C_2H_2Br_4$

b, Ta có: $m_{C_2H_2Br_4}=0,01(mol)\Rightarrow m_{C_2H_2Br_4}=1,86(g)$

c, $n_{Br_2}=0,02(mol)\Rightarrow V=0,01(l)$

\(n_{Br_2}=\dfrac{m_{Br_2}}{M_{Br_2}}=\dfrac{56}{160}=0,35mol\)

Gọi \(n_{C_2H_4}\) là x \(\Rightarrow V_{C_2H_4}=22,4x\)

       \(n_{C_2H_2}\) là y \(\Rightarrow V_{C_2H_2}=22,4y\)
\(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)

   x           x                       ( mol )

\(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)

  y          2y                     ( mol )

Ta có:

\(\left\{{}\begin{matrix}22,4x+22,4y=5,6\\x+2y=0,35\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}x=0,15\\y=0,1\end{matrix}\right.\)

\(\Rightarrow V_{C_2H_4}=22,4.0,15=3,36l\)

\(\Rightarrow V_{C_2H_2}=22,4.0,1=2,24l\)

\(\%V_{C_2H_4}=\dfrac{3,36}{5,6}.100=60\%\)

\(\%V_{C_2H_2}=\dfrac{2,24}{5,6}.100=40\%\)

nhh khí = 5,6/22,4 = 0,25 (mol)

Gọi nC2H4 = a (mol); nC2H2 = b (mol)

a + b = 0,25 (1)

nBr2 = 56/160 = 0,35 (mol)

PTHH: 

C2H4 + Br2 -> C2H4Br2

Mol: a ---> a 

C2H2 + 2Br2 -> C2H2Br4

Mol: b ---> 2b

a + 2b = 0,35 (2)

(1)(2) => a = 0,15 (mol); b = 0,1 (mol)

%VC2H2 = 0,15/0,25 = 60%

%VC2H4 = 100% - 60% = 40%