a, Ta có: \(n_{CH_4}+n_{C_2H_4}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\left(1\right)\)

\(16n_{CH_4}+28n_{C_2H_4}=3\left(2\right)\)

Từ (1) và (2) \(\Rightarrow\left\{{}\begin{matrix}n_{CH_4}=0,1\left(mol\right)\\n_{C_2H_4}=0,05\left(mol\right)\end{matrix}\right.\)

\(\Rightarrow\left\{{}\begin{matrix}\%m_{CH_4}=\dfrac{0,1.16}{3}.100\%\approx53,33\%\\\%m_{C_2H_4}\approx46,67\%\end{matrix}\right.\)

- Ở cùng điều kiện nhiệt độ và áp suất, % số mol cũng là %V.

\(\Rightarrow\left\{{}\begin{matrix}\%V_{CH_4}=\dfrac{0,1}{0,15}.100\%\approx66,67\%\\\%V_{C_2H_4}\approx33,33\%\end{matrix}\right.\)

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

Có: m _tăng = m_C2H4 = 0,05.28 = 1,4 (g)

a) \(n_{hh}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)

Gọi \(\left\{{}\begin{matrix}n_{CH_4}=a\left(mol\right)\\n_{C_2H_4}=b\left(mol\right)\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}a+b=0,15\\16a+28b=3\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}a=0,1\\b=0,05\end{matrix}\right.\)

\(\Rightarrow\left\{{}\begin{matrix}\%V_{CH_4}=\dfrac{0,1}{0,15}.100\%=66,67\%\\\%V_{C_2H_4}=100\%-66,67\%=33,33\%\end{matrix}\right.\)

\(\Rightarrow\left\{{}\begin{matrix}\%m_{CH_4}=\dfrac{0,1.16}{3}.100\%=53,33\%\\\%m_{C_2H_4}=100\%-53,33\%=46,67\%\end{matrix}\right.\)

b) \(m=m_{C_2H_4}=0,05.28=1,4\left(g\right)\)

ta có :

nBr2=\(\dfrac{16}{160}=0,1mol\)

C2H4+Br2->C2H4Br2

0,1------0,1

=>VC2H4=0,1.22,4=2,24l

=>VCH4=3,36l->n CH4=0,15 mol

->%VC2H4=\(\dfrac{2,24}{5,6}.100\)=40%

=>%VCH4=60%

c)

CH4+2O2-to>CO2+2H2O

0,15---------------0,15

C2H4+3O2--to>2CO2+2H2O

0,1--------------------0,2
=>m CaCO3=0,35.100=35g

Ta có: \(n_{Br_2}=\dfrac{24}{160}=0,15\left(mol\right)\)

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

Theo PT: \(n_{C_2H_4}=n_{Br_2}=0,15\left(mol\right)\)

\(\Rightarrow\left\{{}\begin{matrix}\%V_{C_2H_4}=\dfrac{0,15.22,4}{4,48}.100=75\%\\\%V_{CH_4}=25\%\end{matrix}\right.\)

ko bt

cảm ơn bạn nhiều nha 

+Có vẻ như bạn cân bằng sai  thì phải  (CH4 +2O2 =)CO2 +2)H2O

\(m_{tăng}=m_{C_2H_4}=5.6\left(g\right)\)

\(m_{CH_4}=8.8-5.6=3.2\left(g\right)\)

\(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)

\(\%CH_4=\dfrac{3.2}{8.8}\cdot100\%=36.36\%\)

\(\%C_2H_4=100-36.36=63.64\%\)

\(m_{C_2H_4Br_2}=188\cdot0.2=37.6\left(g\right)\)