a, \(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)

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

Theo PT: \(n_{C_2H_2}=\dfrac{1}{2}n_{Br_2}=0,05\left(mol\right)\)

\(\Rightarrow V_{C_2H_2}=0,05.22,4=1,12\left(l\right)\)

\(\Rightarrow V_{CH_4}=3,36-1,12=2,24\left(l\right)\)

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

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

\(n_{CH_4}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\)

Theo PT: \(n_{O_2}=2n_{CH_4}+\dfrac{5}{2}n_{C_2H_2}=0,325\left(mol\right)\)

\(\Rightarrow V_{O_2}=0,325.22,4=7,28\left(l\right)\Rightarrow V_{kk}=5V_{O_2}=36,4\left(l\right)\)

Theo PT: \(n_{CO_2}=n_{CH_4}+2n_{C_2H_2}=0,2\left(mol\right)\)

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

\(\Rightarrow n_{CaCO_3}=n_{CO_2}=0,2\left(mol\right)\Rightarrow m_{CaCO_3}=0,2.100=20\left(g\right)\)

a)\(n_{CaCO_3}=\dfrac{2}{100}=0,02mol\)

\(CO_2+Ca\left(OH\right)_2\rightarrow CaCO_3+H_2O\)

0,02                           0,02

\(CH_4+2O_2\rightarrow CO_2+2H_2O\)

0,02                  0,02

\(V_{CH_4}=0,02\cdot22,4=0,448l\)

b) \(V_{CH_4}=90\%V_{tựnhiên}\)

\(\Rightarrow V_{tựnhiên}=\dfrac{V_{CH_4}}{90\%}=\dfrac{0,448}{90\%}\approx0,5l\)

\(a)\\ CH_4 + 2O_2 \xrightarrow{t^o} CO_2 + 2H_2O\\ 2C_2H_2 + 5O_2 \xrightarrow{t^o} 4CO_2 + 2H_2O\\ CO_2 + Ca(OH)_2 \to CaCO_3 + H_2O\\ C_2H_2 + 2Br_2 \to C_2H_2Br_4\\ b) n_{Br_2} = \dfrac{8}{160}=0,05(mol)\\ \Rightarrow n_{C_2H_2}= \dfrac{1}{2}n_{Br_2}= 0,025(mol)\\ n_{CO_2} = n_{CH_4} + 2n_{C_2H_2} = n_{CaCO_3} = \dfrac{50}{100} = 0,5(mol)\\ \Rightarrow n_{CH_4} = 0,5 - 0,025.2 = 0,45(mol)\\ \Rightarrow m = 0,45.16 + 0,05.26 = 8,5(gam)\)

\(\%m_{CH_4} = \dfrac{0,45.16}{8,5}.100\% = 84,7\%\\ \%m_{C_2H_2} = 100\% - 84,7\% = 15,3\%\)

Sửa : 29,25 \(\to\) 29,55

\(C_2H_4 + Br_2 \to C_2H_4Br_2\\ n_{C_2H_4} = n_{Br_2} = \dfrac{8}{160} = 0,05(mol)\\ \Rightarrow m_{C_2H_4} = 0,05.28 = 1,4(gam)\\ CH_4 + 2O_2 \xrightarrow{t^o} CO_2 + 2H_2O\\ C_2H_4 +3O_2 \xrightarrow{t^o} 2CO_2 + 2H_2O\\ CO_2 + Ba(OH)_2 \to BaCO_3 + H_2O\\ n_{CO_2} = n_{CH_4} + 2n_{C_2H_4} = n_{CH_4} + 0,05.2 = n_{BaCO_3} = \dfrac{29,55}{197}=0,15(mol) \\ \Rightarrow n_{CH_4} = 0,05(mol)\\ \Rightarrow m_{CH_4} = 0,05.16 = 0,8(gam)\)

Đầu tiên, không có nước Br chỉ có nước Br2 em nhé!

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nBr2= 8/160=0,05(mol)

PTHH: C2H4 + Br2 -> C2H4Br2

nC2H4=nBr2=0,05(mol) => mC2H4=0,05.28=1,4(g)

- Khí bay ra là khí CH4.

CH4 + 2 O2 -to-> CO2 + 2 H2O

CO2 + Ba(OH)2 -> BaCO3 + H2O

nBaCO3=29,25/197= 117/ 788 (mol ) (Số xấu quá em ơi)

=> nCH4=nCO2=nBaCO3= 117/788(mol)

=> mCH4=16. 117/788= 468/197(g)

Chọn A

CO₂ + Ca(OH)₂ -> CaCO₃ + H₂O

0,4                     <-  40/100

C₄H₁₀ + 13/2 O₂ -> 4 CO₂ + 5 H₂O

                                   0,4

ð n_C4H10 = 0,4 . 22,4 = 8,96 lít

\(C_4H_{10}+\dfrac{13}{2}O_2-t^0->4CO_2+5H_2O\\ a.V_{KK}=\dfrac{5,6\cdot\dfrac{13}{2}}{0,2}=182\left(L\right)\\ b.CO_2+Ca\left(OH\right)_2->CaCO_3+H_2O\\ m_{KT}=100\cdot\dfrac{5,6}{22,4}\cdot4=100g\)

Câu 4 :

a.  \(n_{CaCO_3}=\dfrac{20}{100}=0,2\left(mol\right)\)

PTHH 1 : 2CO + O₂ -> 2CO₂

                  0,2                            0,2

                CO₂ + Ca(OH)₂ -> CaCO₃ + H₂O

                 0,2                             0,2

PTHH 2 : \(n_{Cu}=\dfrac{19.2}{64}=0,3\left(mol\right)\)

H₂ + CuO -----t^o----> Cu + H₂O

 0,3                            0,3

\(V_{CO}=0,2.22,4=4,48\left(l\right)\)

\(V_{H_2}=0,3.22,4=6,72\left(l\right)\)

b. Cách 1 :

\(n_{hh}=0,3+0,2=0,5\left(mol\right)\)

\(V_{hh}=4,48+6,72=11,2\left(l\right)\)

Ta có : % thể tích= % số mol

\(\%V_{CO}=\dfrac{0.2}{0.5}=40\%\\ \%V_{H_2}=\dfrac{0.3}{0.5}=60\%\)

Cách 2 : 

\(m_{hh}=0,2.28+0,3.2=6,2\left(g\right)\)

\(\%m_{CO}=\dfrac{0,2.28}{6,2}=90,32\%\)

\(\%m_{H_2}=\dfrac{0,3.2}{6,2}=9,68\%\)

a, - Xét phần 1:

m_{kết tủa} = m_CaCO3 = 20 (g)

=> \(n_{CaCO_3}=\dfrac{20}{100}=0,2\left(mol\right)\)

PTHH: Ca(OH)₂ + CO₂ ---> CaCO₃↓ + H₂O

                               0,2<--------0,2

- Xét phần 2:

\(n_{Cu}=\dfrac{19,2}{64}=0,3\left(mol\right)\)

PTHH:

CO + CuO --t^o--> Cu + CO₂

0,2------------------->0,2

H₂ + CuO --t^o--> Cu + H₂O

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

=> V = (0,1 + 0,2).2.22,4 = 13,44 (l)

b, - Phần trăm về khối lượng:

\(\left\{{}\begin{matrix}\%m_{CO}=\dfrac{0,2.2.28}{0,1.2.2+0,2.2.28}=96,55\%\\\%m_{H_2}=100\%-96,55\%=3,45\%\end{matrix}\right.\)

- Phần trăm về thể tích (cũng chính là phần trăm về số mol):

\(\left\{{}\begin{matrix}\%V_{CO}=\dfrac{0,2}{0,3}=66,67\%\\\%V_{H_2}=100\%-66,67\%=33,33\%7\end{matrix}\right.\)

Đó e

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