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)

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

\(n_{hh}=\dfrac{6.72}{22.4}=0.3\left(mol\right)\)

\(n_{Br_2}=0.1\cdot2=0.2\left(mol\right)\)

\(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)

\(0.2..........0.2\)

\(n_{CH_4}=0.3-0.2=0.1\left(mol\right)\)

Câu b anh nghĩ phải là đốt cháy sau đó dẫn sản phẩm vào Ba(OH)₂ dư nha .

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

\(0.1.....................0.1\)

\(Ba\left(OH\right)_2+CO_2\rightarrow BaCO_3+H_2O\)

\(.............0.1.......0.1\)

\(m_{BaCO_3}=0.1\cdot197=19.7\left(g\right)\)

Em cảm ơn ạ

\(V_{khí.thoát.ra}=V_{CH_4}=2,24l\)

\(n_{hh}=\dfrac{6,72}{22,4}=0,3mol\)

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

\(\left\{{}\begin{matrix}\%V_{CH_4}=\dfrac{0,1}{0,3}.100=33,33\%\\\%V_{C_2H_4}=100\%-33,33\%=66,67\%\end{matrix}\right.\)

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

\(200ml=0,2l\)

\(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)

0,2         0,2                       ( mol )

\(C_{MBr_2}=\dfrac{0,2}{0,2}=1M\)

m_tăng = m_C2H4 = 2,8 (g)

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

=> V_C2H4 = 0,1.22,4 = 2,24 (l)

=> V_CH4 = 4,48 - 2,24 = 2,24 (l)

C2H4+Br2-to>C2H4Br2

0,01---0,01 mol

n C2H4=\(\dfrac{2,8}{28}\)=0,1 mol

=>VC2H4=0,01.22,4=2,24l

=>VCH4=2,24

\(n_{hhkhí}=\dfrac{7,84}{22,4}=0,35\left(mol\right)\\ m_{tăng}=m_{C_2H_4}=4,2\left(g\right)\\ n_{C_2H_4}=\dfrac{4,2}{28}=0,15\left(mol\right)\\ n_{CH_4}=0,35-0,15=0,2\left(mol\right)\\ \left\{{}\begin{matrix}\%V_{C_2H_4}=\dfrac{0,15}{0,35}=42,85\%\\\%V_{CH_4}=100\%-42,85\%=57,15\%\end{matrix}\right.\)

PTHH:

C₂H₄ + 3O₂ --t^o--> 2CO₂ + 2H₂O

0,15 ------------------> 0,3

CH₄ + O₂ --t^o--> CO₂ + 2H₂O

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

Ca(OH)₂ + CO₂ ---> CaCO₃ + H₂O

                   0,5 -------> 0,5

\(m_{CaCO_3}=0,5.100=50\left(g\right)\)

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

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

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

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

a.\(n_{hh}=\dfrac{6,72}{22,4}=0,3mol\)

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

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

   x                            x                  ( mol )

\(C_2H_4+3O_2\rightarrow\left(t^o\right)2CO_2+2H_2O\)

    y                             2y                    ( mol )

\(n_{CaCO_3}=\dfrac{40}{100}=0,4mol\)

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

                  0,4              0,4                 ( mol )

Ta có:

\(\left\{{}\begin{matrix}x+y=0,3\\x+2y=0,4\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}x=0,2\\y=0,1\end{matrix}\right.\)

\(\%V_{CH_4}=\dfrac{0,2}{0,3}.100=66,67\%\)

\(\%V_{C_2H_4}=100\%-66,67\%=33,33\%\)

b.\(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)

      0,1       0,1                        ( mol )

\(m_{Br_2}=0,1.160:10\%=160g\)

PTHH: C₂H₄ + Br₂ --> C₂H₄Br₂

              0,1<--0,1

=> \(\%V_{C_2H_4}=\dfrac{0,1.22,4}{22,4}=10\%\)

=> %V_CH4 = 100% - 10% = 90%

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