B.

6,72 lít.

B

B

Chọn D.

a. \(n_X=\dfrac{V_{O_2}}{22,4}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\)

\(n_{CO_2}=\dfrac{V_{O_2}}{22,4}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\)

+ Bảo toàn C:

\(\Rightarrow n_{CH_4}+2n_{C_2H_4}=0,3\left(mol\right)\)

Mà: \(n_{CH_4}+n_{C_2H_4}=0,2\left(mol\right)\)

\(\Rightarrow0,2+n_{C_2H_4}=0,3\)

\(\Leftrightarrow n_{C_2H_4}=0,3-0,2=0,1\left(mol\right)\)

Phần trăm theo thể tích từng khí X là:

\(\%V_{C_2H_4}=\dfrac{0,1.100\%}{0,2}=50\%\)

\(\%V_{C_2H_4}=100\%-50\%=50\%\)

b. Bảo toàn H

\(\Rightarrow n_H=4n_{CH_4}+4n_{C_2H_4}\)

\(\Leftrightarrow n_H=4\left(n_{CH_4}+n_{C_2H_4}\right)\)

\(\Leftrightarrow n_H=4\left(0,1+0,1\right)\)

\(\Leftrightarrow n_H=4.0,2=0,8\left(mol\right)\)

\(\Rightarrow n_{H_2O}=\dfrac{n_H}{2}=\dfrac{0,8}{2}=0,4\left(mol\right)\)

Khối lượng nước thu được:

\(\Rightarrow m_{H_2O}=n_{H_2O}.M_{H_2O}=0,4.18=7,2\left(g\right)\)

\(\%m_{Fe}=100-43,24=56,76\%\\ X+HCl\\ Fe+2HCl\rightarrow FeCl_2+H_2\\ n_{Fe}=\dfrac{14,8.56,76\%}{56}=0,15\left(mol\right)\\ Tacó:n_{H_2}=n_{Fe}=0,15\left(mol\right)\\ \Rightarrow V_{H_2}=0,15.22,4=3,36\left(l\right)\\ \Rightarrow ChọnD\)

D

\(Đặt:n_{CH_4}=a\left(mol\right),n_{C_2H_4}=b\left(mol\right)\)

\(\Rightarrow a+b=0.15\left(1\right)\)

\(n_{CO_2}=\dfrac{4.48}{22.4}=0.2\left(mol\right)\)

\(CH_4+2O_2\underrightarrow{t^0}CO_2+2H_2O\)

\(C_2H_4+3O_2\underrightarrow{t^0}2CO_2+2H_2O\)

\(\Rightarrow a+2b=0.2\left(2\right)\)

\(\left(1\right),\left(2\right):a=0.1,b=0.05\)

Vì : tỉ lệ thể tích tương ứng với tỉ lệ số mol : 

\(\%n_{CH_4}=\dfrac{0.1}{0.15}\cdot100\%=66.67\%\)

\(\%n_{C_2H_4}=100-66.67=33.33\%\)

Chúc em học tốt !!

Đặt \(\left\{{}\begin{matrix}n_{CH_4}=x\left(mol\right)\\n_{C_2H_4}=y\left(mol\right)\end{matrix}\right.\)

\(\Sigma n_{hhkA}=\dfrac{3,36}{22,4}=0,15\\ \rightarrow x+y=0,15\left(1\right)\)

\(PTHH:CH_4+2O_2\underrightarrow{t^o}CO_2+2H_2O\)

(mol)........x....->...2x.......x..............2x

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

(mol)........y......->...3y...........2y........2y

\(\Sigma n_{CO_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\\ \rightarrow x+2y=0,2\)

Giải hpt (1) (2) ta được x=0,1 ; y=0,05

\(\%V_{CH_4}=\dfrac{0,1.22,4}{3,36}.100\%=66,67\%\\ \%V_{C_2H_4}=100\%-66,67\%=33,33\%\)

Gọi số mol của metan(CH4) là x, số mol của tean(C2H6) là y

CH4+O2−→CO2

C2H6+O2−→2CO2

nA = x+ y= 3,36\22,4=0,150 mol (1) 

   nCO2 = x + 2y=4,4822,4= 0,20 mol 

Từ (1) và (2) => x = 0,1mol;  y=0,05mol

⇒ %VCH4 =0,1\0,15.100%= 66,7% và %VC2H6

a, PT: \(C_2H_2+AgNO_3+NH_3\rightarrow Ag_2C_{2\downarrow}+NH_4NO_3\)

\(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)

b, Ta có: \(V_{CH_4}=V_Y=0,56\left(mol\right)\Rightarrow\%V_{CH_4}=\dfrac{0,56}{6,72}.100\%\approx8,33\%\)

\(V_{C_2H_4}=V_X-V_{CH_4}=3,92\left(l\right)\Rightarrow\%V_{C_2H_4}=\dfrac{3,92}{6,72}.100\%\approx58,34\left(\%\right)\)

\(\Rightarrow V_{C_2H_2}=6,72-4,48=2,24\left(l\right)\Rightarrow\%V_{C_2H_2}=\dfrac{2,24}{6,72}.100\%\approx33,33\%\)

c, \(n_{Ag_2C_2}=n_{C_2H_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\)

\(\Rightarrow m_{Ag_2C_2}=0,1.240=24\left(g\right)\)

a

a, PT: \(CH_4+2O_2\underrightarrow{t^o}CO_2+2H_2O\)

\(2H_2+O_2\underrightarrow{t^o}2H_2O\)

Ta có: \(n_{CH_4}+n_{H_2}=\dfrac{11,2}{22,4}=0,5\left(mol\right)\left(1\right)\)

Theo PT: \(n_{H_2O}=2n_{CH_4}+n_{H_2}=\dfrac{16,2}{18}=0,9\left(mol\right)\left(2\right)\)

Từ (1) và (2) \(\Rightarrow\left\{{}\begin{matrix}n_{CH_4}=0,4\left(mol\right)\\n_{H_2}=0,1\left(mol\right)\end{matrix}\right.\)

\(\Rightarrow\left\{{}\begin{matrix}\%V_{CH_4}=\dfrac{0,4.22,4}{11,2}.100\%=80\%\\\%V_{H_2}=20\%\end{matrix}\right.\)

b, Theo PT: \(n_{CO_2}=n_{CH_4}=0,4\left(mol\right)\Rightarrow V_{CO_2}=0,4.22,4=8,96\left(l\right)\)

8g brom sau phản ứng :) ?

TK