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PTHH: \(CH_4+2O_2\underrightarrow{t^o}CO_2+2H_2O\)
\(CO_2+Ba\left(OH\right)_2\rightarrow BaCO_3\downarrow+H_2O\)
Ta có: \(n_{H_2O}=\dfrac{7,2}{18}=0,4\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}n_{CO_2}=n_{BaCO_3}=0,2\left(mol\right)=n_{CH_4}\\n_{O_2}=0,4\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{BaCO_3}=0,2\cdot197=39,4\left(g\right)\\V_{CH_4}=0,2\cdot22,4=4,48\left(l\right)\\V_{kk}=\dfrac{0,4\cdot22,4}{20\%}=44,8\left(l\right)\end{matrix}\right.\)
\(n_{C_2H_4}=\dfrac{8,96}{22,4}=0,4\left(mol\right)\)
C2H4 + 3O2 ----to---> 2CO2 + 2H2O
0,4 1,2 0,8
\(m_{H_2O}=0,8.18=14,4\left(g\right)\)
\(V_{kk}=5V_{O_2}=5.1,2.22,4=134,4\left(l\right)\)
\(n_{C_2H_2}=\dfrac{2,24}{22,4}=0,1mol\)
\(2C_2H_2+5O_2\rightarrow\left(t^o\right)4CO_2+2H_2O\)
0,1 0,25 ( mol )
\(V_{kk}=0,25.22,4.5=28l\)
a, \(V_{O_2}=61,6.20\%=12,32\left(l\right)\Rightarrow n_{O_2}=\dfrac{12,32}{22,4}=0,55\left(mol\right)\)
PT: \(2C_2H_6+7O_2\underrightarrow{t^o}4CO_2+6H_2O\)
\(C_3H_4+4O_2\underrightarrow{t^o}3CO_2+2H_2O\)
Ta có: \(n_{C_2H_6}+n_{C_3H_4}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\left(1\right)\)
Theo PT: \(n_{O_2}=\dfrac{7}{2}n_{C_2H_6}+4n_{C_3H_4}=0,55\left(2\right)\)
Từ (1) và (2) \(\Rightarrow\left\{{}\begin{matrix}n_{C_2H_6}=0,1\left(mol\right)\\n_{C_3H_4}=0,05\left(mol\right)\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}\%V_{C_2H_6}=\dfrac{0,1.22,4}{3,36}.100\%\approx66,67\%\\\%V_{C_3H_4}\approx33,33\%\end{matrix}\right.\)
b, \(C_3H_4+2Br_2\rightarrow C_3H_4Br_4\)
Ta có: \(n_{Br_2}=2n_{C_3H_4}=0,1\left(mol\right)\)
\(\Rightarrow m_{Br_2}=0,1.60=16\left(g\right)\Rightarrow m_{ddBr_2}=\dfrac{16}{8\%}=200\left(g\right)\)
C2H4+2O2-to>CO2+2H2O
0,25---0,5-------0,25
nC2H4=0,25 mol
VCO2=0,25.22,4=5,6
Vkk=0,5.5.22,4=56l
