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

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

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

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

\(a,n_{\left(CH_3COO\right)_2Mg}=\dfrac{7,1}{142}=0,05\left(mol\right)\)

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

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

\(\rightarrow V_{H_2}=0,05.22,4=1,12\left(l\right)\\ b,C\%_{CH_3COOH}=\dfrac{0,1.60}{100}.100\%=6\%\)

\(c,n_{C_2H_5OH}=\dfrac{6,9}{46}=0,15\left(mol\right)\)

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

bđ          0,1                 0,15

pư          0,1                 0,1

spư         0                     0,05                          0,1

\(\rightarrow m_{este}=0,1.80\%.88=7,04\left(g\right)\)

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

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

=> \(C_{M\left(dd.CH_3COOH\right)}=\dfrac{0,02}{0,05}=0,4M\)

b) V_H2 = 0,01.22,4 = 0,224 (l)

a) 

\(n_{Zn}=\dfrac{16,25}{65}=0,25\left(mol\right)\)

PTHH: Zn + H₂SO₄ --> ZnSO₄ + H₂

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

=> V_H2 = 0,25.22,4 = 5,6 (l)

b) \(C_{M\left(dd.H_2SO_4\right)}=\dfrac{0,25}{0,3}=\dfrac{5}{6}M\)

c) \(n_{Fe_2O_3}=\dfrac{32}{160}=0,2\left(mol\right)\)

PTHH: Fe₂O₃ + 3H₂ --t^o--> 2Fe + 3H₂O

Xét tỉ lệ: \(\dfrac{0,2}{1}>\dfrac{0,25}{3}\) => Fe₂O₃ dư, H₂ hết

PTHH: Fe₂O₃ + 3H₂ --t^o--> 2Fe + 3H₂O

           \(\dfrac{0,25}{3}\) <--0,25----->\(\dfrac{0,5}{3}\)

=> \(m=32-\dfrac{0,25}{3}.160+\dfrac{0,5}{3}.56=28\left(g\right)\)

PTHH: \(Zn+H_2SO_4\rightarrow ZnSO_4+H_2\)

đb:       0,25

a) số mol của Zn là: \(n_{Zn}=\dfrac{m_{Zn}}{M_{Zn}}=\dfrac{16,25}{65}=0,25\left(mol\right)\)

Theo PTHH, ta có: \(n_{H_2}=\dfrac{0,25\cdot1}{1}=0,25\left(mol\right)\)

Thể tích của H₂ ở đktc là: \(V_{H_2\left(đktc\right)}=n_{H_2}\cdot22,4=0,25\cdot22,4=5,6\left(l\right)\)

2 câu còn lại mk chịu

em không biết

\(^nFe=\dfrac{8,4}{56}=0,15\left(mol\right)\)

         \(Fe+2HCl\rightarrow FeCl_2+H_2\)

mol  0,15                   0,15      0,15

a)    \(V_X=V_{H_2}=0,15.22,4=3,36\left(l\right)\)

b)   \(^mFeCl_2=0,15.127=19,05\left(g\right)\)

Chúc bạn học tốt!!! 

\(Fe+2HCl\rightarrow FeCl_2+H_2\)

a)\(n_{Fe}=0,15mol\Rightarrow n_{M_2}=0,15mol\Rightarrow V=0,15.22,4=3,36l\)

b)\(n_{FeCl_2}=n_{Fe}=0,15mol\Rightarrow m_{muối}=0,15.127=19,05g\)

đổi 500ml = 0,5l

n_{(CH\(_3\)COOH)\(_2\)Mg}= \(\dfrac{14,2}{142}\)= 0,1mol

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

    _{0,2mol                                0,1mol                   0,1mol}

a/ C_CH3COOH= \(\dfrac{0,2}{0,5}\)=0,4M

b/ V_{H\(_2\)} 0,1 . 22,4 = 2,24l

c/ n_{CH\(_3\)COOH}= 0,2mol

  CH₃COOH + NaOH \(\rightarrow\) CH₃COONa + H₂ 

     _{0,2mol             0,2mol}

V\(_{dd_{NaOH}}\)= \(\dfrac{0,2}{0,5}\)= 0,4l 

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

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

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