Bài 1 : 

\(n_{hỗn.hợp.khí}=\dfrac{0,56}{22,4}=0,025\left(mol\right)\)

\(n_{Br2}=\dfrac{5,6}{160}=0,035\left(mol\right)\)

a) Pt : \(C_2H_4+Br_2\rightarrow C_2H_4Br_2|\)

               1         1              1

                a        1a

              \(C_2H_2+2Br_2\rightarrow C_2H_2Br_4|\)

                 1           2                 1

                   b         2b

Ta có hệ phương trình : 

        a + b = 0,025

       1a + 2b = 0,035

      ⇒ \(\left\{{}\begin{matrix}a=0,015\\b=0,01\end{matrix}\right.\)

b) ⁰/₀V_C2H4 = \(\dfrac{0,015.100}{0,025}=60\)⁰/₀

      ⁰/₀V_C2H2 = \(\dfrac{0,01.100}{0,025}=40\)⁰/₀

 Chúc bạn học tốt

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

\(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)

Giả sử: \(\left\{{}\begin{matrix}n_{C_2H_4}=x\left(mol\right)\\n_{C_2H_2}=y\left(mol\right)\end{matrix}\right.\)

\(\Rightarrow x+y=\dfrac{1,344}{22,4}=0,06\left(1\right)\)

Ta có: \(n_{Br_2}=\dfrac{16}{160}=0,1\left(mol\right)\)

Theo PT: \(n_{Br_2}=n_{C_2H_4}+2n_{C_2H_2}=x+2y\left(mol\right)\)

⇒ x + 2y = 0,1 (2)

Từ (1) và (2) \(\Rightarrow\left\{{}\begin{matrix}x=0,02\left(mol\right)\\y=0,04\left(mol\right)\end{matrix}\right.\)

\(\Rightarrow\left\{{}\begin{matrix}\%V_{C_2H_4}=\dfrac{0,02}{0,06}.100\%\approx33,33\%\\\%\text{ }V_{C_2H_2}\approx66,67\%\end{matrix}\right.\)

b, Ta có: 1/2 hỗn hợp khí gồm: 0,01 mol C₂H₄ và 0,02 mol C₂H₂.

PT: \(C_2H_4+3O_2\underrightarrow{t^o}2CO_2+2H_2O\)

\(2C_2H_2+5O_2\underrightarrow{t^o}4CO_2+2H_2O\)

Theo PT: \(n_{CO_2}=2n_{C_2H_4}+2n_{C_2H_2}=0,06\left(mol\right)\)

\(CO_2+Ca\left(OH\right)_2\rightarrow CaCO_{3\downarrow}+H_2O\)

Theo PT: \(n_{CaCO_3}=n_{CO_2}=0,06\left(mol\right)\)

\(\Rightarrow m_{cr}=m_{CaCO_3}=0,06.100=6\left(g\right)\)

Bạn tham khảo nhé!

 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) 
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) 
Giải hệ ta đc: x = 0,015 và y = 0,01
=> %V C2H4 = 0,015/0,025 = 60% ; %V C2H2 = 40%

Bài 3

a) C₂H₄ + Br₂ --> C₂H₄Br₂

C₂H₂ + 2Br₂ --> C₂H₂Br₄

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

Gọi số mol C₂H₄, C₂H₂ là a, b (mol)

=> \(a+b=\dfrac{0,56}{22,4}=0,025\) (1)

PTHH: C₂H₄ + Br₂ --> C₂H₄Br₂

                a---->a

            C₂H₂ + 2Br₂ --> C₂H₂Br₄

                b---->2b

=> a + 2b = 0,035 (2)

(1)(2) => a = 0,015 (mol); b = 0,01 (mol)

=> \(\left\{{}\begin{matrix}\%V_{C_2H_4}=\dfrac{0,015}{0,025}.100\%=60\%\\\%V_{C_2H_2}=\dfrac{0,01}{0,025}.100\%=40\%\end{matrix}\right.\)

Bài 4:

a) 

CH₄ + 2O₂ --t^o--> CO₂ + 2H₂O

2H₂ + O₂ --t^o--> 2H₂O

b) 

Gọi số mol CH₄, H₂ là a, b (mol)

=> \(a+b=\dfrac{11,2}{22,4}=0,5\) (1)

PTHH: CH₄ + 2O₂ --t^o--> CO₂ + 2H₂O

              a-------------------->a--->2a

            2H₂ + O₂ --t^o--> 2H₂O

              b--------------->b

=> \(2a+b=\dfrac{16,2}{18}=0,9\) (2)

(1)(2) => a = 0,4 (mol); b = 0,1 (mol)

=> \(\left\{{}\begin{matrix}\%V_{CH_4}=\dfrac{0,4}{0,5}.100\%=80\%\\\%V_{H_2}=\dfrac{0,1}{0,5}.100\%=20\%\end{matrix}\right.\)

c) 

V_CO2 = 0,4.22,4 = 8,96 (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: \(n_{CaC_2}=n_{C_2H_2}=0,01\left(mol\right)\Rightarrow m_{CaC_2}=0,01.64=0,64\left(g\right)\)

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

giups mình với

C₂H₄+Br₂->C₂H₄Br₂

x----------x---------x

C₂H₂+2Br₂->C₂H₂Br₄

y--------2y------------y

=>\(\left\{{}\begin{matrix}x+y=\dfrac{0,896}{22,4}\\160x+320y=8\end{matrix}\right.\)

=>x=0,03 mol, y=0,01 mol

=>%V_C2H4=\(\dfrac{0,03.22,4}{0,896}\).100=75%

=>%V_C2H2=25%

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

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

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

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

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

\(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)

\(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)

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

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

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

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