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

1.Khí thoát ra là CH4 nCH4=0,1 mol mà tổng n khí=0,15 mol

=>nC2H2=0,05 mol

C2H2+2Br2 =>C2H2Br4

%VCH4=0,1/0,15.100%=66,67%

%VC2H2=33,33%

CH4+2O2=>CO2+2H2O

C2H2+5/2O2=>2CO2+H2O

Tổng mol O2=0,1.2+0,05.2,5=0,325 mol

=>VO2=0,325.22,4=7,28l

=>Vkk=7,28/20%=36,4lít

2.

C2H2        +2Br2=>C2H2Br4

0,025 mol<=0,05 mol

CH4+2O2=>CO2+2H2O
nCaCO3=nCO2=0,15 mol=>nCH4=0,15 mol

nBr2=8/160=0,05 mol=>nC2H2=0,025 mol

%VCH4=0,15/0,175.100%=85,71%

%VC2H2=14,29%
3.

nCO2=11,2/22,4=0,5 mol

C6H12O6=>2C2H5OH +2CO2

0,25 mol<=0,5 mol<=0,5 mol

mC2H5OH=0,5.46=23g

nC6H12O6=(0,5/2)/80%=0,3125 mol

=>m glucozo bđ=0,3125.180=56,25g

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!

Đáp án: D

\(n_{CO_2}=\dfrac{8,96}{22,4}=0,4mol\)

\(m_{tăng}=m_{Br_2}=m_{C_2H_2}=2,6g\)

\(\Rightarrow n_{C_2H_2}=\dfrac{2,6}{26}=0,1mol\)

\(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)

0,1          0,1

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

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

0,1         0,25      0,2

\(\Rightarrow n_{CO_2\left(CH_4\right)}=0,4-0,2=0,2mol\)

\(\Rightarrow n_{CH_4}=0,2mol\Rightarrow n_{O_2}=0,4mol\)

a)\(\%V_{CH_4}=\dfrac{0,2}{0,4}\cdot100\%=50\%\)

\(\%V_{C_2H_2}=100\%-50\%=50\%\)

b)\(\Sigma n_{O_2}=0,4+0,25=0,65mol\)

\(\Rightarrow V_{O_2}=0,65\cdot22,4=14,56l\)

\(\Rightarrow V_{kk}=14,56\cdot5=72,8l\)

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

Ta có: \(n_{CO_2}=\dfrac{1,68}{22,4}=0,075\left(mol\right)=n_{CH_4}\)

Đặt \(\left\{{}\begin{matrix}n_{C_2H_4}=a\left(mol\right)\\n_{C_2H_2}=b\left(mol\right)\end{matrix}\right.\) \(\Rightarrow a+b=\dfrac{5,04}{22,4}-0,075=0,15\)  (1)

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

            \(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)

Theo PTHH: \(28a+26b=4,1\)  (2)

Từ (1) và (2) \(\Rightarrow\left\{{}\begin{matrix}a=n_{C_2H_4}=0,1\left(mol\right)\\b=n_{C_2H_2}=0,05\left(mol\right)\end{matrix}\right.\)

Mặt khác: \(n_{hh}=\dfrac{5,04}{22,4}=0,225\left(mol\right)\) \(\Rightarrow\left\{{}\begin{matrix}\%V_{CH_4}=\dfrac{0,075}{0,225}\cdot100\%\approx33,33\%\\\%V_{C_2H_4}=\dfrac{0,1}{0,225}\cdot100\%\approx44,44\%\\\%V_{C_2H_2}=22,23\%\end{matrix}\right.\)

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

\(n_{hh}=\dfrac{7,84}{22,4}=0,35mol\)

\(C_2B_2+2Br_2\rightarrow C_2H_2Br_4\)

 0,15       0,3                      ( mol )

\(\%V_{C_2H_2}=\dfrac{0,15}{0,35},100=42,85\%\)

\(\%V_{CH_4}=100\%-42,85\%=57,15\%\)

b.\(n_{CH_4}=0,35-0,15=0,2mol\)

\(CH_4+2O_2\rightarrow\left(t^o\right)CO_2+2H_2O\)

 0,2                                          0,4    ( mol )

\(2C_2H_2+5O_2\rightarrow\left(t^o\right)4CO_2+2H_2O\)

  0,15                                          0,15      ( mol )

\(m_{H_2O}=\left(0,4+0,15\right).18=9,9g\)