Ta có: \(n_{Br_2}=\dfrac{48}{160}=0,3\left(mol\right)\)

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

____0,15___0,3 (mol)

\(\Rightarrow\left\{{}\begin{matrix}V_{C_2H_2}=0,15.22,4=3,36\left(l\right)\\V_{CH_4}=2,24\left(l\right)\end{matrix}\right.\)

Bạn tham khảo nhé!

$C_2H_2+2Br_2\to Br_2CH-CHBr_2$

$n_{Br_2}=\dfrac{48}{160}=0,3(mol)$

$\Rightarrow n_{C_2H_2}=\dfrac{n_{Br_2}}{2}=0,15(mol)$

$\Rightarrow V_{C_2H_2}=0,15.22,4=3,36(l)$

$\Rightarrow V_{CH_4}=5,6-3,36=2,24(l)$

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

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

\(n_{C_2H_4}=n_{Br_2}=0,1\left(mol\right)\)

\(\Rightarrow\left\{{}\begin{matrix}\%V_{C_2H_4}=\dfrac{0,1.22,4}{3,36}.100\%\approx66,67\%\\\%V_{CH_4}\approx33,33\%\end{matrix}\right.\)

Đáp án B

0,2 mol hh khí gồm CH₄ và C₂H₂ qua dd brom dư thấy nhạt màu và có 0,1 mol khí thoát ra.

• Khí thoát ra là CH₄ → n_CH4 = 0,1 mol 

Ta có: m _{dd Br2 tăng} = m_C2H4 = 2,8 (g)

\(\Rightarrow n_{C_2H_4}=\dfrac{2,8}{28}=0,1\left(mol\right)\)

\(\Rightarrow\left\{{}\begin{matrix}\%V_{C_2H_4}=\dfrac{0,1.22,4}{3,36}.100\%\approx66,67\%\\\%V_{CH_4}\approx33,33\%\end{matrix}\right.\)

Có: \(n_{CH_4}=\dfrac{3,36}{22,4}-0,1=0,05\left(mol\right)\)

⇒ m _hh = m_CH4 + m_C2H4 = 0,05.16 + 0,1.28 = 3,6 (g)

\(\Rightarrow\left\{{}\begin{matrix}\%m_{CH_4}=\dfrac{0,05.16}{3,6}.100\%\approx22,22\%\\\%m_{C_2H_4}\approx77,78\%\end{matrix}\right.\)

nhh khí = 2,24/22,4 = 0,1 (mol)

nC2H4 = 1,4/28 = 0,05 (mol)

%VC2H4 = 0,05/0,1 = 50%

%VC2H6 = 100% - 50% = 50%

Các bác giup em với 

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

\(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)

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

\(\Rightarrow x+y=\dfrac{2,24}{22,4}=0,1\left(mol\right)\left(1\right)\)

\(n_{Br_2}=n_{C_2H_4}+2n_{C_2H_2}=x+2y=\dfrac{24}{160}=0,15\left(mol\right)\left(2\right)\)

Từ (1) và (2) \(\Rightarrow x=y=0,05\left(mol\right)\)

\(\Rightarrow\%V_{C_2H_4}=\%V_{C_2H_2}=\dfrac{0,05.22,4}{2,24}.100\%=50\%\)