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a.b.\(n_{CO_2}=\dfrac{5,6}{22,4}=0,25mol\)
\(2CH_3COOH+Na_2CO_3\rightarrow2CH_3COONa+CO_2+H_2O\)
0,5 0,25 ( mol )
\(m_{CH_3COOH}=0,5.60=30g\)
\(\%m_{CH_3COOH}=\dfrac{30}{45}.100=66,67\%\)
\(\%m_{C_2H_5OH}=100\%-66,67\%=33,33\%\)
c.\(m_{NaOH}=50.20\%=10g\)
\(n_{NaOH}=\dfrac{10}{40}=0,25mol\)
\(2NaOH+CO_2\rightarrow Na_2CO_3+H_2O\)
\(\dfrac{0,25}{2}\) < \(\dfrac{0,25}{1}\) ( mol )
0,25 0,125 ( mol )
\(m_{Na_2CO_3}=0,125.106=13,25g\)
a)
2CH3COOH + Na2CO3 --> 2CH3COONa + CO2 + H2O
b) \(n_{CO_2}=\dfrac{5,6}{22,4}=0,25\left(mol\right)\)
PTHH: 2CH3COOH + Na2CO3 --> 2CH3COONa + CO2 + H2O
0,5<-----------------------------------0,25
=> mCH3COOH = 0,5.60 = 30 (g)
=> mC2H5OH = 45 - 30 = 15 (g)
c) \(n_{NaOH}=\dfrac{50.20\%}{40}=0,25\left(mol\right)\)
Xét tỉ lệ: \(\dfrac{n_{NaOH}}{n_{CO_2}}=\dfrac{0,25}{0,25}=1\) => Tạo muối NaHCO3
PTHH: NaOH + CO2 --> NaHCO3
0,25-------------->0,25
=> mNaHCO3 = 0,25.84 = 21 (g)
CH3COOH + NaOH → CH3COONa + H2O
Rượu etylic không tác dụng với NaOH.
nNaOH = 0,15mol
=> nCH3COOH = nNaOH = 0,15mol
=> mCH3COOH = 0,15.60 = 9g
=> mC2H5OH = 13,6 − 9 = 4,6g
=> nC2H5OH = 0,1mol
CH3COOH + Na → CH3COONa + H2(1)
2C2H5OH + 2Na → 2C2H5ONa + H2(2)
=> nH2(1) = nCH3COOH = 0,15mol
=> nH2(2) = nC2H5OH = 0,1mol
=> VH2 = (0,15 + 0,1). 22,4 = 5,6l
% khối lượng CH 3 COOH : 1,2/1,66 x 100% = 72,29%
% khối lương C 2 H 5 OH : 0,46/1,66 x 100% = 27,71%
\(n_{H_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\)
\(CH_3COOH+Na\rightarrow CH_3COONa+\dfrac{1}{2}H_2\)
0,1 0,1
\(C_2H_5OH+Na\rightarrow C_2H_5ONa+\dfrac{1}{2}H_2\)
0,1 0,1
Theo pthh có: \(n_A=2nH_2=2.0,1=0,2\left(mol\right)\)
Gọi x, y là số mol của rượu và axit có trong hh A.
có hệ: \(\left\{{}\begin{matrix}x+y=0,2\\60x+46y=10,6\end{matrix}\right.\)
=> x = y = 0,1
=> \(\left\{{}\begin{matrix}\%_{m_{CH_3COOH}}=\dfrac{60.0,1.100}{10,6}=56,6\%\\\%_{m_{C_2H_5OH}}=100-56,6=43,4\%\end{matrix}\right.\)
\(m_{muối}=m_{CH_3COONa}+m_{C_2H_5ONa}=82.0,1+68.0,1=15\left(g\right)\)
100 - 56,6 sao bằng 43,4%
Xem lại đơn vị
- 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) \(m_{C_2H_5ONa}=n.M=0,2\times68=13,6\left(g\right)\)
\(m_{CH_3COONa}=n.M=0,4\times82=32,8\left(g\right)\)
\(C_2H_5OH+K_2CO_3\rightarrow\left(kopứ\right)\)
\(2CH_3COOH+K_2CO_3\rightarrow2CH_3COOK+CO_2+H_2O\)
2 1 2 1 1 (mol)
0,4 0,2 0,4 0,2 0,2 (mol)
\(nCO_2=\dfrac{4,48}{22,4}=0,2\left(mol\right)\)
\(mCH_3COOH=0,4.60=24\left(g\right)\)
\(mK_2CO_3=0,2.138=27,6\left(g\right)\)
\(mCH_3COOK=0,4.98=39,2\left(g\right)\)
\(mCO_2=0,2.44=8,8\left(g\right)\)
\(mdd=mCH_3COOH+mK_2CO_3+mCH_3COOK-mCO_2\)
\(=24+27,6+39,2-8,8=82\left(g\right)\)
\(C\%m_{CH_3COOH}=\dfrac{24.100}{82}=29,27\%\)
\(C\%m_{K_2CO_3}=\dfrac{27,6.100}{82}=33,66\%\)
câu thứ 2 bn tự lm cho bt:>
a) nNaOH = 0,6.1 = 0,6 (mol)
PTHH: NaOH + CH3COOH --> CH3COONa + H2O
0,6----->0,6
=> mCH3COOH = 0,6.60 = 36 (g)
=> mC2H5OH = 45,2 - 36 = 9,2 (g)
b) \(n_{C_2H_5OH}=\dfrac{9,2}{46}=0,2\left(mol\right)\)
PTHH: 2CH3COOH + 2Na --> 2CH3COONa + H2
0,6---------------------------->0,3
2C2H5OH + 2Na --> 2C2H5ONa + H2
0,2--------------------------->0,1
=> V = (0,3 + 0,1).22,4 = 8,96 (l)
