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)PTHH:`

`C_2 H_5 OH + Na -> C_2 H_5 ONa + 1/2H_2\uparrow`

   `0,08`                                                        `0,04`           `(mol)`

`b)m_[C_2 H_5 OH]=11,5 . 40/100 .0,8=3,68 (g)`

   `n_[C_2 H_5 OH]=[3,68]/46=0,08 (mol)`

  `=>V_[H_2]=0,04.22,4=0,896(l)`

a) $C_2H_5OH + 3O_2 \xrightarrow{t^o} 2CO_2 + 3H_2O$

b) $n_{C_2H_5OH} = \dfrac{9,2}{46} = 0,2(mol)$

Theo PTHH : 

$n_{CO_2} = 2n_{C_2H_5OH} = 0,4(mol) \Rightarrow V_{CO_2} = 0,4.22,4 = 8,96(lít)$

$n_{H_2O} = 3n_{C_2H_5OH} = 0,6(mol) \Rightarrow m_{H_2O} = 0,6.18 = 10,8(gam)$

c) $CO_2 + Ca(OH)_2 \to CaCO_3 + H_2O$
$n_{CaCO_3} = n_{CO_2} = 0,4(mol)$

$m_{CaCO_3} = 0,4.100 = 40(gam)$

a) PTHH: C2H6O + 3 O2 -to-> 2CO2 + 3 H2O

b) nC2H6O=0,1(mol) => nCO2=2.0,1=0,2(mol)

PHHH: CO2 + Ca(OH)2 -> CaCO3 + H2O

nCaCO3=nCO2=0,2(mol)

=>m(kết tủa)=mCaCO3=0,2.100=20(g)

nC2H5OH = 4.6/46 = 0.1 (mol) 

C2H5OH + 3O2 -to-> 2CO2 + 3H2O 

0.1.................................0.2

Ca(OH)2 + CO2 => CaCO3 + H2O 

.....................0.2............0.2

mCaCO3 = 0.2 * 100 = 20 (g) 

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%

\(\Rightarrow n_{C_2H_6O\left(TT\right)}=\dfrac{\dfrac{1}{15}}{90\%}=\dfrac{2}{27}\left(mol\right)\)

\(\Rightarrow m_{C_2H_6O}=\dfrac{2}{27}.46=\dfrac{92}{27}\left(g\right)\)

a, \(C_2H_6O+3O_2\underrightarrow{t^o}2CO_2+3H_2O\)

b, \(n_{CO_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\)

Theo PT: \(n_{O_2}=\dfrac{3}{2}n_{CO_2}=0,3\left(mol\right)\)

\(\Rightarrow V_{O_2}=0,3.22,4=6,72\left(l\right)\)

c, \(n_{C_2H_6O}=\dfrac{1}{2}n_{CO_2}=0,1\left(mol\right)\)

\(\Rightarrow m_{C_2H_6O}=0,1.46=4,6\left(g\right)\)

\(\Rightarrow V_{C_2H_6O}=\dfrac{4,6}{0,8}=5,75\left(ml\right)\)

Độ rượu = \(\dfrac{5,75}{50}.100=11,5^o\)

\(n_{C_2H_5OH}=\dfrac{2,3}{46}=0,05\left(mol\right)\)

PTHH: C₂H₅OH + 3O₂ --t^o--> 2CO₂ + 3H₂O

              0,05----------------->0,1

=> m_CO2 = 0,1.44 = 4,4 (g)

a) PTHH \(C_2H_5OH+3O_2\underrightarrow{t^o}2CO_2+3H_2O\)

b) Khối lượng mol của rượu etylic là \(M_{etylic}=2M_C+5M_H+M_O+M_H=2.12+5.1+16+1=46\left(g/mol\right)\)

Số mol rượu etylic tham gia phản ứng là \(n_{etylic}=\dfrac{m_{etylic}}{M_{etylic}}=\dfrac{2,3}{46}=0,05\left(mol\right)\)

PTHH \(C_2H_5OH+3O_2\underrightarrow{t^o}2CO_2+3H_2O\)

TL mol      1         :    3   :      2     :     3

pứ mol     0,05     :    ?   :      ?     :      ?

\(\Rightarrow n_{CO_2}=0,1\left(mol\right)\)

Khối lượng mol của CO₂ là \(M_{CO_2}=M_C+2M_O=12+2.16=44\left(g/mol\right)\)

Khối lượng CO₂ hình thành là \(m_{CO_2}=n_{CO_2}.M_{CO_2}=0,1.44=4,4\left(g\right)\)

c) Dễ dàng tính được \(n_{O_2}=1,5\left(mol\right)\)

Thể tích khí oxi cần dùng là \(V_{O_2}=n_{O_2}.22,4=0,15.22,4=3,36\left(l\right)\)

Thể tích không khí cần dùng là \(V_{kk}=\dfrac{V_{O_2}.100\%}{21\%}=\dfrac{3,36.100}{21}=16\left(l\right)\)