a) 

\(V_{C_2H_5OH}=\dfrac{96.20}{100}=19,2\left(ml\right)\)

=> \(m_{C_2H_5OH}=19,2.0,8=15,36\left(g\right)\)

b) \(n_{C_2H_5OH}=\dfrac{15,36}{46}=\dfrac{192}{575}\left(mol\right)\)

\(V_{H_2O}=20-19,2=0,8\left(ml\right)\)

=> \(m_{H_2O}=0,8.1=0,8\left(g\right)\)

=> \(n_{H_2O}=\dfrac{0,8}{18}=\dfrac{2}{45}\left(mol\right)\)

PTHH: 2C₂H₅OH + 2Na --> 2C₂H₅ONa + H₂

               \(\dfrac{192}{575}\)------------------------->\(\dfrac{96}{575}\)

             2H₂O + 2Na --> 2NaOH + H₂

              \(\dfrac{2}{45}\)----------------------->\(\dfrac{1}{45}\)

=> \(V_{H_2}=22,4.\left(\dfrac{96}{575}+\dfrac{1}{45}\right)=4,238\left(l\right)\)

C2H5OH + Na -- > C2H5OHNa + 1/2 H2

Na+H2O --- > NaOH + 1/2H2

Vr = 20x96/100 = 19,2ml = 0.0192 (l)

mC2H5OH = D.V = 19,2 x 0.8 = 15.36 (g)

nC2H5OH = m/M = 15.36 / 46 = 0.43 (mol) 

=> nH2 = 0.215 (mol)

VH2O = 1 ml => mH2O = 1 (g)

=> nH2O = m/M = 1/18 = 0.056 (mol)

=> nH2 = 0.028 (mol)

nH2 = 0.215 + 0.028 = 0.243 (mol)

=> VH2 = 22.4 x 0,243  = 5,4432 (l)

\(n_{CH_3COOH}=\dfrac{300\cdot5\%}{60}=0.25\left(mol\right)\)

\(2CH_3COOH+Zn\rightarrow\left(CH_3COO\right)_2Zn+H_2\)

\(0.25........................................................0.125\)

\(V_{H_2}=0.125\cdot22.4=2.8\left(l\right)\)

\(n_{C_2H_5OH}=0.1\cdot2=0.2\left(mol\right)\)

\(CH_3COOH+C_2H_5OH⇌CH_3COOC_2H_5+H_2O\left(ĐK:H_2SO_{4\left(đ\right)},t^0\right)\)

\(0.2......................0.2.....................0.2\)

\(\Rightarrow CH_3COOHdư\)

\(m_{CH_3COOC_2H_5}=0.2\cdot88=17.6\left(g\right)\)

a) n CH3COOH = 300.5%/60 = 0,25(mol) 

Zn + 2CH3COOH $\to$ (CH3COO)2Zn + H2

Theo PTHH :

n H2 = 1/2 n CH3COOH = 0,25/2 = 0,125(mol)

V H2 = 0,125.22,4 = 2,8(lít)

b) n C2H5OH = 0,1.2 = 0,2(mol)

\(CH_3COOH + C_2H_5OH \buildrel{{H_2SO_4,t^o}}\over\rightleftharpoons CH_3COOC_2H_5 + H_2O\)

Ta thấy :

n CH3COOH = 0,25 > n C2H5OH = 0,2  => CH3COOH dư

n CH3COOC2H5 = n C2H5OH = 0,2 mol

=> m CH3COOC2H5 = 0,2.88 = 17,6 gam

Đáp án D

Chọn đáp án D

Lên men rượu:

⇒ có 2,5kg glucozơ chứa 20% tạp chất

⇔ n_glucozơ = 2500 × 0,8 ÷ 180 = 11,11 mol.

Từ tỉ lệ phản ứng

⇒ có 22,22 mol C₂H₅OH được sinh ra.

Mà rượu bị hao hụt mất 10%

⇒ thể tích rượu 40° (có d = 0,8 g/mL) thu được là

Vr=Vhh.Đr/100=35.92/100=32.2ml

mr=D.V=0,8.32.2=25.76g

Bài 1:

PTHH: \(C_2H_5OH+O_2\xrightarrow[]{mengiấm}CH_3COOH+H_2O\)

Ta có: \(n_{C_2H_5OH}=\dfrac{115\cdot0,8}{46}=2\left(mol\right)=n_{CH_3COOH\left(lýthuyết\right)}\)

\(\Rightarrow m_{CH_3COOH\left(thực\right)}=2\cdot60\cdot90\%=108\left(g\right)\)

Bài 2:

PTHH: \(C_2H_5OH+CH_3COOH\xrightarrow[H_2SO_4\left(đ\right)]{t^o}CH_3COOC_2H_5+H_2O\)

Ta có: \(\left\{{}\begin{matrix}n_{CH_3COOH}=\dfrac{60}{60}=1\left(mol\right)\\n_{C_2H_5OH}=\dfrac{92}{46}=2\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\) Rượu còn dư, Axit p/ứ hết

\(\Rightarrow n_{CH_3COOC_2H_5\left(lýthuyết\right)}=1\left(mol\right)\) \(\Rightarrow m_{CH_3COOC_2H_5\left(thực\right)}=1\cdot88\cdot80\%=70,4\left(g\right)\)