Đốt cháy hoàn toàn 3,36 khí etilen
a) viết PTHH sảy ra
b) tính thể tích khí oxi và thể tích khí co2
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a.\(C_2H_4+3O_2\underrightarrow{t^o}2CO_2+2H_2O\)
b. 1 3 2 2 ( mol )
0,15 0,45 0,3
\(n_{C_2H_4}=\dfrac{V_{C_2H_4}}{22,4}=\dfrac{3,36}{22,4}=0,15mol\)
\(V_{O_2}=n_{O_2}.22,4=0,45.22,4=10,08l\)
\(V_{CO_2}=n_{CO_2}.22,4=0,3.22,4=6,72l\)
a)PTHH: \(2KClO_3\xrightarrow[MnO_2]{t^o}2KCl+3O_2\uparrow\)
b) Ta có: \(n_{KClO_3}=\dfrac{49}{122,5}=0,4\left(mol\right)\) \(\Rightarrow n_{O_2}=0,6\left(mol\right)\)
\(\Rightarrow V_{O_2}=0,6\cdot22,4=13,44\left(l\right)\)
c) PTHH: \(4P+5O_2\underrightarrow{t^o}2P_2O_5\)
Theo PTHH: \(n_P=\dfrac{4}{5}n_{O_2}=0,48\left(mol\right)\)
\(\Rightarrow m_P=0,48\cdot31=14,88\left(g\right)\)
a, \(CH_4+2O_2\underrightarrow{t^o}CO_2+2H_2O\)
b, \(n_{CH_4}=\dfrac{9,6}{16}=0,6\left(mol\right)\)
Theo PT: \(n_{CO_2}=n_{CH_4}=0,6\left(mol\right)\Rightarrow V_{CO_2}=0,6.22,4=13,44\left(l\right)\)
c, \(n_{O_2}=2n_{CH_4}=1,2\left(mol\right)\Rightarrow V_{O_2}=1,2.22,4=26,88\left(l\right)\)
\(\Rightarrow V_{kk}=\dfrac{V_{O_2}}{20\%}=134,4\left(l\right)\)
\(n_{Fe}=\dfrac{42}{56}=0,75\left(mol\right)\\ a,PTHH:3Fe+2O_2\rightarrow\left(t^o\right)Fe_3O_4\\ b,n_{O_2}=\dfrac{2}{3}.0,75=0,5\left(mol\right)\\ V_{O_2\left(đktc\right)}=0,5.22,4=11,2\left(l\right)\\ V_{kk}=5.V_{O_2\left(đktc\right)}=5.11,2=56\left(l\right)\)
a)2H2 + O2 --to--> 2H2O
b) \(n_{H_2}=\dfrac{11,2}{22,4}=0,5\left(mol\right)\)
PTHH: 2H2 + O2 --to--> 2H2O
0,5-->0,25------>0,5
=> \(m_{H_2O}=0,5.18=9\left(g\right)\)
c) VO2 = 0,25.22,4 = 5,6 (l)
=> Vkk = 5,6 : 20% = 28 (l)
\(n_{C_2H_6O}=\dfrac{23}{46}=0,5\left(mol\right)\)
PTHH: C2H6O + 3O2 --to--> 2CO2 + 3H2O
0,5------------------->1
=> VCO2 = 1.22,4 = 22,4 (l)
a, \(n_{CH_4}=\dfrac{5,6}{22,4}=0,25\left(mol\right)\)
PTHH: CH4 + 2O2 ----to---> CO2 + 2H2O
Mol: 0,25 0,5
b, \(V_{O_2}=0,5.22,4=11,2\left(l\right)\Rightarrow V_{kk}=11,2.5=56\left(l\right)\)
\(n_{O_2}=\dfrac{5,6}{22,4}=0,25\left(mol\right)\\a, 4P+5O_2\rightarrow\left(t^o\right)2P_2O_5\\b,n_{P_2O_5}=\dfrac{2}{5}.0,25=0,1\left(mol\right)\Rightarrow m_{P_2O_5}=142.0,1=14,2\left(g\right)\\c,V_{kk\left(đktc\right)}=4.5,6=28\left(lít\right) \)
\(n_{C_2H_4}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\\ a,PTHH:C_2H_4+3O_2\rightarrow\left(t^o\right)2CO_2+2H_2O\\ b,n_{O_2}=3.n_{C_2H_4}=3.0,15=0,45\left(mol\right)\\ n_{CO_2}=n_{CH_4}=0,15\left(mol\right)\\ V_{O_2\left(đktc\right)}=0,45.22,4=10,08\left(l\right)\\ V_{CH_4\left(đktc\right)}=0,15.22,4=3,36\left(l\right)\)
Đề hỏi đktc em nhỉ?