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a, PT: \(CH_4+2O_2\underrightarrow{t^o}CO_2+2H_2O\)
\(C_2H_4+3O_2\underrightarrow{t^o}2CO_2+2H_2O\)
Ta có: \(n_{CH_4}+n_{C_2H_4}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\left(1\right)\)
Theo PT: \(n_{CO_2}=n_{CH_4}+2n_{C_2H_4}=\dfrac{8,96}{22,4}=0,4\left(mol\right)\left(2\right)\)
Từ (1) và (2) \(\Rightarrow\left\{{}\begin{matrix}n_{CH_4}=0,2\left(mol\right)\\n_{C_2H_4}=0,1\left(mol\right)\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}\%V_{CH_4}=\dfrac{0,2.22,4}{6,72}.100\%\approx66,67\%\\\%V_{C_2H_4}\approx33,33\%\end{matrix}\right.\)
b, Theo PT: \(n_{O_2}=2n_{CH_4}+3n_{C_2H_4}=0,7\left(mol\right)\)
\(\Rightarrow V_{O_2}=0,7.22,4=15,68\left(l\right)\)
\(n_{C_2H_4} = \dfrac{44,8}{22,4} = 2(mol)\\ C_2H_4 + 3O_2 \xrightarrow{t^o} 2CO_2 + 2H_2O\\ n_{O_2} = 3n_{C_2H_4} = 6(mol)\\ m_{O_2} = 6.32 = 192(gam)\)
\(C_2H_4+3O_2\underrightarrow{t^o}2CO_2+2H_2O\)
\(\dfrac{5,6}{22,4}=0,25\left(mol\right)\)
\(nO_2=3.0,25=0,75\left(mol\right)\)
\(VO_2=0,75.22,4=16,8\left(l\right)\)
\(nCO_2=2.0,25=0,5\left(mol\right)\)
\(VCO_2=0,5.224=11,2\left(l\right)\)
a, \(C_2H_4+3O_2\underrightarrow{t^o}2CO_2+2H_2O\)
Ta có: \(n_{C_2H_4}=\dfrac{11,2}{22,4}=0,5\left(mol\right)\)
Theo PT: \(n_{O_2}=3n_{C_2H_4}=1,5\left(mol\right)\Rightarrow V_{O_2}=1,5.22,4=33,6\left(l\right)\)
b, \(V_{kk}=\dfrac{V_{O_2}}{20\%}=168\left(l\right)\)
TK
Từ C2H4O2 ta có: M = 60 g/mol; mC = 2 x 12 = 24 g; mH = 4 x 1 = 4 g;
MO = 2 x 16 = 32 g.
%C = (24 : 60) x 100% = 40%; %H = (4 : 60) x 100% = 6,67%;
%O = 100% - 40% - 6,67% = 53,33%.
PTHH: \(C_2H_4+3O_2\underrightarrow{t^o}2CO_2+2H_2O\)
\(n_{C_2H_4}=\dfrac{11,2}{22,4}=0,5\left(mol\right)\)
Theo PTHH: \(n_{O_2}=3.n_{C_2H_4}=3.0,5=1,5\left(mol\right)\)
=> \(V_{O_2\left(đktc\right)}=1,5.22,4=33,6\left(l\right)\)
câu b oxi chiếm bao nhiêu của kk vậy bạn
\(n_{Mg}=\dfrac{m}{M}=\dfrac{4,8}{24}=0,2\left(mol\right)\\ PTHH:2Mg+O_2\underrightarrow{t^o}2MgO\\ \left(mol\right)-0,2--0,1--0,2\\ V_{O_2}=n.22,4=0,1.22,4=2,24\left(l\right)\)