a,VddC2H5OH=23+27=50(ml)

Đr=\(\dfrac{23}{50}\).100=46^o

b,mC2H5OH=23.0,8=18,4(g)

nC2H5OH=\(\dfrac{18,4}{46}\)=0,4(mol)

PTHH: 2C₂H₅OH + 2K ---> 2C₂H₅OK + H₂

            0,4-------------------------------------->0,2

=> V_H2 = 0,2.24 = 4,8 (l

a,VddC2H5OH=23+27=50(ml) 

Đr=2350.100=46ob, mC2H5OH=23.0,8=18,4(g)

nC2H5OH=18,446=0,4(mol)a,

VddC2H5OH=23+27=50(ml)Đr=2350.100=46ob,

mC2H5OH=23.0,8=18,4(g)

nC2H5OH=18,446=0,4(mol)

PTHH: 2C₂H₅OH + 2K ---> 2C₂H₅OK + H₂

            0,4-------------->0,2

=> V_H2 = 0,2.24 = 4,8 (l)

\(a,V_{C_2H_5OH}=\dfrac{10.96}{100}=9,6\left(ml\right)\\ m_{C_2H_5OH}=9,6.0,8=7,68\left(g\right)\\ n_{C_2H_5OH}=\dfrac{7,68}{46}=\dfrac{96}{575}\left(mol\right)\)

PTHH: 2C₂H₅OH + 2Na ---> 2C₂H₅ONa + H₂

              \(\dfrac{96}{575}\)------------------------------------->\(\dfrac{48}{575}\)

\(V_{H_2}=\dfrac{48}{575}.22,4=1,87\left(l\right)\)

\(b,V_{dd}=12+10,6=20,6\left(ml\right)\\ Đ_r=\dfrac{9,6}{20,6}.100=46,6^o\)

n_H2 = 85,12 : 22,4 = 3,8 (mol) ; n_H2O = V_H2O.D = 108 (g) => n_H2O = 108/18 = 6 (mol)

PTHH:

2Na + 2C₂H₅OH → 2C₂H₅ONa + H₂↑

                x          → 0,5x    (mol)

2Na + 2H₂O → 2NaOH + H₂↑

           6       → 3       (mol)

Ta có: n_H2 = 0,5x + 3 = 3,8

=> x = 1,6 (mol) = n_C2H5OH

m_C2H5OH = 1,6.46 = 73,6 (g)

C6H12O6-lm->2C2H5OH+2CO2

0,2--------------------0,4-------0,4

n C6H12O6=0,2 mol

=>VCO2=0,4.22,4=8,96l

=>m C2H5OH=0,4.46=18,4g

\(a,n_{C_6H_{12}O_6}=\dfrac{36}{180}=0,2\left(mol\right)\)

PTHH: \(C_6H_{12}O_6\underrightarrow{\text{men rượu}}2C_2H_5OH+2CO_2\uparrow\)

               0,2----------------->0,4----------->0,4

=> V_CO2 = 0,4.22,4 = 8,96 (l)

b, m_C2H5OH = 0,4.46.50% = 9,2 (g)

\(c,V_{C_2H_5OH}=\dfrac{9,2}{0,8}=11,5\left(ml\right)\\ \rightarrow V_{ddC_2H_5OH}=\dfrac{11,5.100}{60}=\dfrac{115}{6}\left(ml\right)\)

\(a,V_{C_2H_5OH}=\dfrac{96.30}{100}=28,8\left(ml\right)\\ \rightarrow m_{C_2H_5OH}=28,8.0,8=23,04\left(ml\right)\\ \rightarrow n_{C_2H_5OH}=\dfrac{23,04}{46}=0,5\left(mol\right)\)

PTHH: 2C₂H₅OH + 2Na ---> 2C₂H₅ONa + H₂

               0,5----------------------------------->0,25

\(\rightarrow V_{H_2}=0,25.22,4=5,6\left(l\right)\)

b, \(n_{CH_3COOH}=\dfrac{36}{60}=0,6\left(mol\right)\)

PTHH: \(C_2H_5OH+CH_3COOH\xrightarrow[t^o]{H_2SO_{4\left(đ\right)}}CH_3COOC_2H_5+H_2O\)

LTL: 0,5 < 0,6 => CH₃COOH dư

Theo pthh: n_CH3COOH = n_C2H5OH = 0,5 (mol)

=> m_este = 0,5.88.70% = 30,8 (g)

nC2H5OH=0,5(mol)

V(C2H5OH)=23/0,8=28,75(ml)

=> A=D_r= (28,75/250).100=11,5^o

PTHH: C2H5OH + O2 -men giấm---> CH3COOH + H2O

nCH3COOH=C2H5OH=0,5(mol)

=>mCH3COOH=0,5. 60=30(g)

=> m(giấm ăn)= 30/5%=600(g)

=>a=600(g)

Cho mình hỏi m(giấm ăn) là chất tan hay dung dịch 

Chọn đáp án B.

a, \(n_{C_2H_4}=\dfrac{15,68}{22,4}=0,7\left(mol\right)\)

PT: \(C_2H_4+H_2O\underrightarrow{^{t^o,xt}}C_2H_5OH\)

Theo PT: \(n_{C_2H_5OH\left(LT\right)}=n_{C_2H_4}=0,7\left(mol\right)\)

Mà: H = 90%

\(\Rightarrow n_{C_2H_5OH\left(TT\right)}=0,7.90\%=0,63\left(mol\right)\)

\(\Rightarrow m_{C_2H_5OH\left(TT\right)}=0,63.46=28,98\left(g\right)\)

\(\Rightarrow V_{C_2H_5OH}=\dfrac{28,98}{0,8}=36,225\left(ml\right)\)

b, \(C_2H_5OH+O_2\underrightarrow{^{mengiam}}CH_3COOH+H_2O\)

Theo PT: \(n_{CH_3COOH}=n_{C_2H_5OH}=0,63\left(mol\right)\)

\(\Rightarrow m_{CH_3COOH}=0,63.60=37,8\left(g\right)\)

\(\Rightarrow m_{ddCH_3COOH}=\dfrac{37,8}{5\%}=756\left(g\right)\)