\(n_{\left(CH_3COO\right)_2Mg}=\dfrac{2,84}{142}=0,02\left(mol\right)\)

PTHH : 

\(Mg+2CH_3COOH\rightarrow\left(CH_3COO\right)_2Mg+H_2\uparrow\)

                0,04                     0,02                0,02 

\(a,C_M=\dfrac{n}{V}=\dfrac{0,04}{0,1}=0,4M\)

\(b,V_{H_2}=0,02.22,4=0,448\left(l\right)\)

\(c,PTHH:\)

\(CH_3COOH+C_2H_5OH\underrightarrow{t^o,H_2SO_{4\left(đ\right)}}CH_3COOC_2H_5+H_2O\)

0,04                                                         0,04 

\(m_{este}=0,04.90\%.88=3,168\left(g\right)\)

a) \(n_{\left(CH_3COO\right)_2Mg}=\dfrac{1,42}{142}=0,01\left(mol\right)\)

PTHH: Mg + 2CH₃COOH --> (CH₃COO)₂Mg + H₂

                           0,02<-----------0,01-------->0,01

=> V_H2 = 0,01.22,4 = 0,224 (l)

\(C_{M\left(CH_3COOH\right)}=\dfrac{0,02}{0,2}=0,1M\)

b) 

PTHH: CH₃COOH + NaOH --> CH₃COONa + H₂O

                  0,02------>0,02

=> \(V_{dd.NaOH}=\dfrac{0,02}{0,2}=0,1\left(l\right)=100\left(ml\right)\)

pt 2CH3COOH+Mg\(\rightarrow\)(CH3COO)2Mg +H2

n(CH3COO)2Mg =1,42/142=0,1 mol

theo pt nCH3COOH =2 n (CH3COO)2Mg =0,1 mol

suy ra Cm=0,2 /0,5=0.4 mol/l

theo pt nH2 =n (CH3COO)2Mg =0,1 mol

suy ra v h2 =2,24l

\(n_{\left(CH_3COO\right)_2Mg}=\dfrac{1,42}{142}=0,01\left(mol\right)\)

Pt: \(2CH_3COOH+Mg\rightarrow\left(CH_3COO\right)_2Mg+H_2\)

0,02 <---------------------------0,01 ---------------> 0,01

a) \(C_{M_{axit}}=\dfrac{0,02}{0,05}=0,4M\)

b) \(V_{H_2}=0,01.22,4=0,224l\)

a.\(n_{\left(CH_3COO\right)_2Mg}=\dfrac{14,2}{142}=0,1mol\)

\(2CH_3COOH+Mg\rightarrow\left(CH_3COO\right)_2Mg+H_2\)

         0,2                                0,1                    0,1   ( mol )

\(C_{M_{CH_3COOH}}=\dfrac{0,2}{0,25}=0,8M\)

\(V_{H_2}=0,1.22,4=2,24l\)

b.\(NaOH+CH_3COOH\rightarrow CH_3COONa+H_2O\)

      0,2               0,2                                               ( mol )

\(V_{NaOH}=\dfrac{0,2}{0,5}=0,4l\)

\(n_{\left(CH_3COO\right)_2Mg}=\dfrac{14,2}{142}=0,1\left(mol\right)\)

PTHH: 2CH₃COOH + Mg ---> (CH₃COO)₂Mg + H₂

              0,2<---------------------------0,1---------->0,1

=> \(\left\{{}\begin{matrix}C_{M\left(CH_3COOH\right)}=\dfrac{0,2}{0,25}=0,8M\\V_{H_2}=0,1.22,4=2,4\left(l\right)\end{matrix}\right.\)

PTHH: CH₃COOH + NaOH ---> CH₃COONa + H₂O

           0,2------------->0,2

=> \(V_{ddNaOH}=\dfrac{0,2}{0,5}=0,4\left(l\right)\)

\(n_{\left(CH_3COO\right)_2Mg}=\dfrac{0,71}{142}=0,005\left(mol\right)\)

PTHH: 2CH₃COOH + Mg ---> (CH₃COO)₂Mg + H₂

                0,01<----------------------0,005---------->0,005

\(C_{M\left(CH_3COOH\right)}=\dfrac{0,01}{0,025}=4M\)

PTHH: CH₃COOH + NaOH ---> CH₃COONa + H₂O

              0,005--------->0,005

\(V_{ddNaOH}=\dfrac{0,005}{0,75}=\dfrac{1}{150}M\\ V_{H_2}=0,005.22,4=0,0112\left(l\right)\)

giúp đi tr

2CH3COOH+Zn->(CH3COO)2Zn+H2

0,074-------------------------0,037----0,037

n (CH3COO)2Zn=0,037 mol

=>CM =\(\dfrac{0,074}{0,025}\)=3M

=>VH2=0,037.22,4=0,8288l

2CH3COOH+Mg->(CH3COO)2Mg+H2

0,02---------------0,01-------0,01----------0,01

n muối=0,01mol

=>CM=\(\dfrac{0,02}{0,04}=0,5M\)

=>VH2=0,01.22,4=0,224l

CH3COOH+NaOH->CH3COONa+H2O

0,02--------------0,02

=>VNaOH=\(\dfrac{0,02}{0,75}=0,03l\)

a) \(n_{\left(CH_3COO\right)_2Mg}=\dfrac{1,42}{142}=0,01\left(mol\right)\)

PTHH: Mg + 2CH₃COOH --> (CH₃COO)₂Mg + H₂

           0,01<-------0,02<------------0,01------->0,01

=> \(C_{M\left(dd.CH_3COOH\right)}=\dfrac{0,02}{0,04}=0,5M\)

b) V_H2 = 0,01.22,4 = 0,224 (l)

c) 

PTHH: NaOH + CH₃COOH --> CH₃COONa + H₂O

             0,02<------0,02

=> \(V_{dd.NaOH}=\dfrac{0,02}{0,75}=\dfrac{2}{75}\left(l\right)=\dfrac{80}{3}\left(ml\right)\)

\(a.2CH_3COOH+Mg\rightarrow\left(CH_3COO\right)_2Mg+H_2\\ n_{\left(CH_3COO\right)_2Mg}=0,01\left(mol\right)\\ n_{CH_3COOH}=2n_{\left(CH_3COO\right)_2Mg}=0,02\left(mol\right)\\ \Rightarrow CM_{CH_3COOH}=\dfrac{0,02}{0,04}=0,5M\\ b.n_{H_2}=n_{\left(CH_3COO\right)_2Mg}=0,01\left(mol\right)\\ \Rightarrow V_{H_2}=0,01.22,4=0,224\left(l\right)\\ c.CH_3COOH+NaOH\rightarrow CH_3COONa+H_2O\\ n_{CH_3COOH}=n_{NaOH}=0,02\left(mol\right)\\ \Rightarrow V_{NaOH}=\dfrac{0,02}{0,75}=0,02667\left(l\right)=26,67ml\)

2CH3COOH + Mg ---> (CH3COO)2Mg + H2

nCH3COOH = 2n(muối) = 2.14,2/142 = 0,2 mol. ---> CM = n/V = 0,2/0,1 = 2M.

b) 50 ml axit trên có số mol 0,1 mol. ---> nNaOH = 0,1 mol ----> mdd = 40.0,1.100/20 = 20 gam.

n_(CH3COO)2Mg=0.1 mol

2CH₃COOH + Mg -------> (CH₃COO)₂Mg + H₂

0.2 0.1 0.1 0.1 (mol)

CM_CH3COOH​ =0.2/0.1=2M

b, n_{CH3COOH =} 2 .0.005 =0.1 mol

CH₃COOH + NaOH -------> CH₃COONa + H₂O

0.1 0.1 mol

m_NaOH= 0,1.40=4(g)

C%= (m_ct .100%)/ mdd => m_dd=20g