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\(PTHH:C_2H_5OH+3O_2\rightarrow^{t^o}2CO_2+3H_2O\\ m_{C_2H_5OH}=115\cdot0,8=92\left(g\right)\\ \Rightarrow n_{C_2H_5OH}=\dfrac{92}{46}=2\left(mol\right)\\ \Rightarrow n_{O_2}=6\left(mol\right)\\ \Rightarrow V_{O_2}=6\cdot22,4=134,4\left(l\right)\\ \Rightarrow V_{kk}=\dfrac{134,4\cdot100\%}{20\%}=672\left(l\right)\)
\(V_{C_2H_5OH}=\dfrac{20.96}{100}=19,2\left(ml\right)\)
=> \(m_{C_2H_5OH}\) = 19,2.0,8 = 15,36 (g)
=> \(n_{C_2H_5OH}=\dfrac{15,36}{46}=\dfrac{192}{575}\left(mol\right)\)
PTHH: \(C_2H_5OH+3O_2\underrightarrow{t^o}2CO_2+3H_2O\)
Theo PTHH: \(n_{O_2}=\dfrac{576}{575}\left(mol\right)\Rightarrow V_{O_2\left(đktc\right)}=\dfrac{576}{575}.22,4=\dfrac{12902,4}{575}\left(l\right)\)
\(n_{CO_2}=\dfrac{4,48}{22,4}=0,2mol\)
\(C_2H_5OH+3O_2\underrightarrow{t^o}2CO_2+3H_2O\)
0,2 0,6 0,4 0,6
a)\(m_{C_2H_5OH}=0,2\cdot46=9,2g\)
b)\(V_{O_2}=0,6\cdot22,4=13,44l\)
\(\Rightarrow V_{kk}=5V_{O_2}=5\cdot13,44=67,2l\)
PTHH: \(C_2H_5OH+3O_2\xrightarrow[]{t^o}2CO_2+3H_2O_{ }\)
\(CO_2+Ca\left(OH\right)_2\rightarrow CaCO_3\downarrow+H_2O\)
a) Ta có: \(n_{CaCO_3}=\dfrac{160}{100}=1,6\left(mol\right)=n_{CO_2}\) \(\Rightarrow n_{O_2}=2,4\left(mol\right)\)
\(\Rightarrow V_{kk}=\dfrac{2,4\cdot22,4}{20\%}=268,8\left(l\right)\)
b) Theo PTHH: \(n_{C_2H_5OH}=\dfrac{1}{2}n_{CO_2}=0,8\left(mol\right)\)
\(\Rightarrow a=C\%_{C_2H_5OH}=\dfrac{0,8\cdot46}{50\cdot0,8}\cdot100\%=92\%=92^o\)
a) C2H5OH + 3O2 --to--> 2CO2 + 3H2O
b) \(n_{C_2H_5OH}=\dfrac{2,3}{46}=0,05\left(mol\right)\)
PTHH: C2H5OH + 3O2 --to--> 2CO2 + 3H2O
0,05-->0,15-------->0,1
=> VCO2 = 0,1.22,4 = 2,24 (l)
c) VO2 = 0,15.22,4 = 3,36 (l)
=> Vkk = 3,36 : 20% = 16,8 (l)
a, \(C_2H_6O+3O_2\underrightarrow{t^o}2CO_2+3H_2O\)
b, \(n_{C_2H_6O}=\dfrac{23}{46}=0,5\left(mol\right)\)
Theo PT: \(n_{O_2}=3n_{C_2H_6O}=1,5\left(mol\right)\)
\(\Rightarrow V_{O_2}=1,5.22,4=33,6\left(l\right)\)
c, \(V_{C_2H_6O}=\dfrac{100.46}{100}=46\left(ml\right)\)
\(\Rightarrow m_{C_2H_6O}=46.0,8=36,8\left(g\right)\)
\(\Rightarrow n_{C_2H_6O}=\dfrac{36,8}{46}=0,8\left(mol\right)\)
PT: \(C_2H_5OH+Na\rightarrow C_2H_5ONa+\dfrac{1}{2}H_2\)
Theo PT: \(n_{H_2}=\dfrac{1}{2}n_{C_2H_5ONa}=0,4\left(mol\right)\)
\(\Rightarrow V_{H_2}=0,4.22,4=8,96\left(l\right)\)
a, \(n_{O_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\)
PT: \(C_2H_6O+3O_2\underrightarrow{t^o}2CO_2+3H_2O\)
Theo PT: \(n_{CO_2}=\dfrac{2}{3}n_{O_2}=\dfrac{2}{15}\left(mol\right)\Rightarrow V_{CO_2}=\dfrac{2}{15}.22,4=\dfrac{224}{75}\left(l\right)\)
b, \(n_{C_2H_6O\left(LT\right)}=\dfrac{1}{3}n_{O_2}=\dfrac{1}{15}\left(mol\right)\)
Mà: H = 90%
\(\Rightarrow n_{C_2H_6O\left(TT\right)}=\dfrac{\dfrac{1}{15}}{90\%}=\dfrac{2}{27}\left(mol\right)\)
\(\Rightarrow m_{C_2H_6O}=\dfrac{2}{27}.46=\dfrac{92}{27}\left(g\right)\)
Đáp án A
Ta có sơ đồ quá trình: (C6H10O5)n → nC6H12O6 → 2nC2H5OH + 2nCO2↑.
nC2H5OH = 5 × 103 × 0,2 × 0,8 ÷ 46 ≈ 17,4 mol ⇒ nCO2 = 17,4 mol.
||⇒ VCO2 = 17,4 × 22,4 = 389,76 lít ⇒ V ≈ 0,39 m3.
► mngô = 17,4 ÷ 2 ÷ 0,8 ÷ 0,65 × 162 = 2710,38 g ⇒ m ≈ 2,7 kg
\(a,C_2H_5OH+3O_2\xrightarrow{t^o}2CO_2+3H_2O\\ b,m_{C_2H_5OH}=49.0,8=39,2(g)\\ \Rightarrow n_{C_2H_5OH}=\dfrac{39,2}{46}=\dfrac{98}{115}(mol)\\ \Rightarrow n_{O_2}=\dfrac{98}{115}.3=\dfrac{294}{115}(mol)\\ \Rightarrow V_{kk}=\dfrac{\dfrac{294}{115}.22,4}{20\%}\approx286,33(l)\)
a) C2H5OH + 3O2 --to-->2CO2 + 3H2O
b) \(m_{C_2H_5OH}=0,8.49=39,2\left(g\right)=>n_{C_2H_5OH}=\dfrac{39,2}{46}=\dfrac{98}{115}\left(mol\right)\)
PTHH: C2H5OH + 3O2 --to-->2CO2 + 3H2O
_______\(\dfrac{98}{115}\)-->\(\dfrac{294}{115}\)
=> \(V_{O_2}=\dfrac{294}{115}.22,4=57,266\left(l\right)\)
=> Vkk = 57,266 : 20% = 286,33(l)