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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) VH2 = 0,01.22,4 = 0,224 (l)
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
=> VH2 = 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
=> \(V_{dd.NaOH}=\dfrac{0,02}{0,2}=0,1\left(l\right)=100\left(ml\right)\)
\(n_{\left(CH_3COO\right)_2Mg}=\dfrac{2,84}{142}=0,02\left(mol\right)\)
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.\(n_{\left(CH_3COO\right)_2Mg}=\dfrac{14,2}{142}=0,1mol\)
\(2CH_3COOH+Mg\rightarrow\left(CH_3COO\right)_2Mg+H_2\)
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
=> \(V_{ddNaOH}=\dfrac{0,2}{0,5}=0,4\left(l\right)\)
CH3COOH + Mg ---> CH3COOMg + 1/2H2
(mol) 0,026 0,026 0,013
a) nCH3COOMg = 2,13 : 83 = 0,026 mol
=> C\(_M\)CH3COOH = 0,026 : 0,02 = 1,3 M
b) V\(_{H2}\)= 0,013 . 22,4 = 0,2912(lit)
c) CH3COOH + NaOH ----> CH3COONa + H2O
\(n_{\left(CH_3COO\right)_2Mg}=\dfrac{0,71}{142}=0,005\left(mol\right)\)
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
\(V_{ddNaOH}=\dfrac{0,005}{0,75}=\dfrac{1}{150}M\\ V_{H_2}=0,005.22,4=0,0112\left(l\right)\)
a , ta có
pt1: HCl + Na2SO3 --> H2O + 2NaCl + SO2
0,01(mol) 0,01(mol)
pt2 : H2SO4 + Na2SO3 -->H2O + Na2SO2 + SO2
0,02(mol) 0,02(mol)
pt3 : HCl + BaCl2 --> k tác dụng :)
pt4 : H2SO4 + BaCl2 --> 2HCl + BaSO4
0,02(mol) 0,02(mol)
b, nSO2 =\(\frac{0,672}{22,4}\)=0,03( mol) ; nBaSO4=\(\frac{4,66}{233}\)=0,02 ( mol) ; 50 (ml) = 0,05 (lít)
=> nH2SO4=nBaSO4
=0,02 (mol)
từ pt2 ta có : nSO2 = nH2SO4
= 0,02 (mol)
từ pt1 và pt2 ta có : nSO2(pt1)= nSO2 - nSO2(pt2)
=0,03 -0,02 =0,01 (mol)
=> CM HCl = \(\frac{0,01}{0,05}\)= 0,2(M)
=> CM H2SO4=\(\frac{0,02}{0,05}\)=0,4(M)
ko biết đúng ko . :v
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) \(V_{H_2}=0,01.22,4=0,224l\)