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a) PTTH: \(2H_2+O_2\rightarrow2H_2O\)
\(C_2H_2+\dfrac{5}{2}O_2\underrightarrow{t^o}2CO_2+H_2O\)
b) Ta có: \(\left\{{}\begin{matrix}\overline{M}_{hhkhí}=0,5\cdot28=14\\n_{hhkhí}=\dfrac{13,44}{22,4}=0,6\left(mol\right)\end{matrix}\right.\)
Theo phương pháp đường chéo, ta có: \(\dfrac{n_{H_2}}{n_{C_2H_2}}=\dfrac{12}{12}=1\)
\(\Rightarrow n_{H_2}=n_{C_2H_2}=0,3\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}\%V_{H_2}=\dfrac{0,3}{0,6}\cdot100\%=50\%\\\%V_{C_2H_2}=50\%\\\%m_{H_2}=\dfrac{0,3\cdot2}{5,6}\cdot100\%\approx10,71\%\\\%m_{C_2H_4}=89,29\%\end{matrix}\right.\)
nSO2= 0,5(mol)
nO2=0,2(mol)
PTHH: 2 SO2 + O2 -to-> 2 SO3
Ta có: 0,5/2 > 0,2/1
=> O2 hết, SO2 dư, tính theo nO2
-> nSO3=nO2.2=0,2.2=0,4(mol)
nSO2(dư)= 0,5-0,2.2=0,1(mol)
=>V(sau p.ứ)= V(SO2,dư,đktc)+V(SO3,đktc)=0,1.22,4+0,4.22,4=11,2(l)
a)
2CO + O2 --to--> 2CO2
2H2 + O2 --to--> 2H2O
b) \(n_{H_2O}=\dfrac{12,6}{18}=0,7\left(mol\right)\); \(n_{CO_2}=\dfrac{13,44}{22,4}=0,6\left(mol\right)\)
PTHH: 2CO + O2 --to--> 2CO2
0,6<--0,3<------0,6
2H2 + O2 --to--> 2H2O
0,7<--0,35<------0,7
=> \(\left\{{}\begin{matrix}V_{CO}=0,6.22,4=13,44\left(l\right)\\V_{H_2}=0,7.22,4=15,68\left(l\right)\end{matrix}\right.\)
VO2 = (0,3 + 0,35).22,4 = 14,56 (l)
c) \(M_A=\dfrac{0,6.28+0,7.2}{0,6+0,7}=14\left(g/mol\right)\)
=> \(d_{A/O_2}=\dfrac{14}{32}=0,4375\)
\(a.2H_2+O_2-^{t^o}\rightarrow2H_2O\\ b.n_{H_2}=\dfrac{8,96}{22,4}=0,4\left(mol\right)\\ n_{O_2}=\dfrac{1}{2}n_{H_2}=0,2\left(mol\right)\\ \Rightarrow V_{O_2}=0,2.22,4=4,48\left(l\right)\\ TrongkhôngkhíO_2chiếm20\%\\ \Rightarrow V_{kk}=\dfrac{4,48}{20\%}=22,4\left(l\right)\)
\(\dfrac{mH2}{mO2}\)=\(\dfrac{3}{8}\)=x
=>;mH2=x=>nH2=\(\dfrac{3x}{2}\)mol
m02=\(\dfrac{8x}{32}\)=\(\dfrac{x}{4}\)mol
PTHH: 2H2 + O2 to→ 2H2O
xét: \(\dfrac{3x}{2}\);\(\dfrac{3x}{12}\)
h2 dư, o2 hết
nh2dư=\(\dfrac{3x}{2}-\dfrac{3x}{12}\)\(=\dfrac{15x}{12}\)=\(\dfrac{1,792}{22,4}\)=0,08(mol)
=>x=\(\dfrac{0,08.12}{15}\)=0,064
nO2=\(\dfrac{0,064}{4}\)=0,016(mol)
nH2=\(\dfrac{0,064.3}{2}\)=0,096(mol)
VQ(đktc)=22,4(0,016+0,096)=2,5088(lít)
a)
\(n_{H_2} = \dfrac{6,72}{22,4} = 0,3(mol)\\ n_{O_2} = \dfrac{2,24}{22,4} = 0,1(mol)\\ 2H_2 + O_2 \xrightarrow{t^o} 2H_2O\)
Ta thấy :
\(\dfrac{n_{H_2}}{2} = 0,15 > \dfrac{n_{O_2}}{1} = 0,1\) nên H2 dư
Theo PTHH : \(n_{H_2O} = 2n_{O_2} = 0,2(mol) \Rightarrow m_{H_2O} = 0,2.18 = 3,6(gam)\)
b)
Ta có : \(n_{H_2\ pư} = 2n_{O_2} = 0,2(mol)\\ \Rightarrow n_{H_2\ dư} = 0,3 - 0,2 = 0,1(mol)\\ \Rightarrow V_{H_2\ dư} = 0,1.22,4 = 2,24(lít)\)