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![](https://rs.olm.vn/images/avt/0.png?1311)
Câu 11 :
\(n_{CH3COOH}=\dfrac{9}{60}=0,15\left(mol\right)\)
a) Pt : \(CH_3COOH+NaOH\rightarrow CH_3COONa+H_2O\)
0,15 0,15 0,15
b) Tính V chứ nhỉ :
\(V_{NaOH}=\dfrac{0,15}{1,5}=0,1\left(l\right)\)
c) \(m_{CH3COONa}=0,15.82=12,3\left(g\right)\)
Chúc bạn học tốt
![](https://rs.olm.vn/images/avt/0.png?1311)
- Đặt \(\left\{{}\begin{matrix}n_{C_2H_5OH}=a\left(mol\right)\\n_{CH_3COOH}=b\left(mol\right)\end{matrix}\right.\) \(\Rightarrow46a+60b=33,2\left(1\right)\)
\(n_{H_2}=\dfrac{V}{22,4}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\)
a) \(2C_2H_5OH+2Na\rightarrow2C_2H_5ONa+H_2\)
2 2 1 (mol)
a a a/2 (mol)
\(2CH_3COOH+2Na\rightarrow2CH_3COONa+H_2\)
2 2 1 (mol)
b b b/2 (mol)
Từ hai PTHH trên ta có: \(\dfrac{a}{2}+\dfrac{b}{2}=n_{H_2}=0,3\Rightarrow a+b=0,6\left(2\right)\)
(1), (2) ta có hệ phương trình: \(\left\{{}\begin{matrix}46a+60b=33,2\\a+b=0,6\end{matrix}\right.\)
Giải ra ta được: \(a=0,2\left(mol\right);b=0,4\left(mol\right)\)
b) \(m_{C_2H_5OH}=n.M=0,2\times46=9,2\left(g\right)\)
\(m_{CH_3COOH}=n.M=0,4\times60=24\left(g\right)\)
c) \(m_{C_2H_5ONa}=n.M=0,2\times68=13,6\left(g\right)\)
\(m_{CH_3COONa}=n.M=0,4\times82=32,8\left(g\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a, \(n_{CH_3COOH}=\dfrac{15}{60}=0,25\left(mol\right)\)
PT: \(CH_3COOH+NaOH\rightarrow CH_3COONa+H_2O\)
Theo PT: \(n_{CH_3COONa}=n_{CH_3COOH}=0,25\left(mol\right)\)
\(\Rightarrow a=m_{CH_3COONa}=0,25.82=20,5\left(g\right)\)
b, \(m_{dd}=\dfrac{15}{2\%}=750\left(g\right)\)
\(n_{CH_3COOH}=\dfrac{15}{60}=0,25\left(mol\right)\\ NaOH+CH_3COOH\rightarrow CH_3COONa+H_2O\\a, n_{CH_3COONa}=n_{CH_3COOH}=0,25\left(mol\right)\\ a=m_{CH_3COONa}=0,25.82=20,5\left(g\right)\\ b,m_{ddCH_3COOH}=\dfrac{15.100}{2}=750\left(g\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có nH2SO4 = 0,2 . 1,5 = 0,3 ( mol )
nBa(OH)2 = 0,3 . 0,8 = 0,24 ( mol )
H2SO4 + Ba(OH)2 → BaSO4 + 2H2O
0,3...........0,24
⇒Lập tỉ số 0,3/1:0,24/1 = 0,3 > 0,24
⇒Sau phản ứng H2SO4 dư , Ba(OH)2 hết
⇒mBaSO4 = 0,24 . 233 = 55,92 ( gam )
⇒nH2SO4 dư = 0,3 - 0,24 = 0,06 ( mol )
⇒CM H2SO4 dư = 0,06 : 0,5 = 0,12 M
![](https://rs.olm.vn/images/avt/0.png?1311)
\(Fe+H_2SO_4\rightarrow FeSO_4+H_2\)
Fe có số mol là \(n_{Fe}=\frac{m}{M}=\frac{11,2}{56}=0,2mol\)
\(H_2SO_4\) có số mol là \(n_{H_2SO_4}=\frac{0,2.1}{1}=0,2mol\)
Có \(V=200ml=0,2l\)
\(\rightarrow C_M=\frac{n_{H_2SO_4}}{V_{H_2SO_4}}=\frac{0,2}{0,2}=1M\)
FeSO\(_4\) có số mol là \(n_{FeSO_4}=\frac{0,2.1}{1}=0,2mol\)
Thể tích của \(FeSO_4\) là \(V_{FeSO_4}=V_{H_2SO_4}\rightarrow C_M=\frac{n}{V}=\frac{0,2}{0,2}=1M\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Fe+H2SO4->feSO4+H2
0,2--0,2---------0,2------0,2
n H2SO2=0,2 mol
=>m Fe=0,2.56=11,2g
=>Cm FeSO4=0,2\0,2=1M
\(n_{H_2SO_4}=0,2.1=0,2\left(mol\right)\\ a.Fe+H_2SO_4\rightarrow FeSO_4+H_2\\ 0,2........0,2.........0,2...........0,2\left(mol\right)\\ b.V_{dd.muối}=V_{ddH_2SO_4}=200\left(ml\right)=0,2\left(l\right)\\ C_{MddFeSO_4}=\dfrac{0,2}{0,2}=1\left(M\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,n_{\left(CH_3COO\right)_2Mg}=\dfrac{7,1}{142}=0,05\left(mol\right)\)
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
\(\rightarrow m_{este}=0,1.80\%.88=7,04\left(g\right)\)
a, \(CH_3COOH+NaOH\rightarrow CH_3COONa+H_2O\)
b, \(n_{NaOH}=0,2.1,5=0,3\left(mol\right)\)
Theo PT: \(n_{CH_3COOH}=n_{NaOH}=0,3\left(mol\right)\Rightarrow m_{CH_3COOH}=0,3.60=18\left(g\right)\)
c, \(n_{CH_3COONa}=n_{NaOH}=0,3\left(mol\right)\Rightarrow m_{CH_3COONa}=0,3.82=24,6\left(g\right)\)