Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
`n_[Na_2 CO_3]=[2,76]/106=0,03(mol)`
`Na_2 CO_3 +2CH_3 COOH->2CH_3 COONa+H_2 O+CO_2\uparrow`
`0,03` `0,06` `0,03` `(mol)`
`CO_2 +Ca(OH)_2 ->CaCO_3 \downarrow+H_2 O`
`0,03` `0,03`
`a)CH_3 COONa` là muối natri axetat.
`V_[dd CH_3 COOH]=[0,06]/[0,2]=0,3(l)`
`b)m_[CaCO_3]=0,03.100=3(g)`
a, CH3COONa: Natri axetat
PT: \(Na_2CO_3+2CH_3COOH\rightarrow2CH_3COONa+CO_2+H_2O\)
Ta có: \(n_{Na_2CO_3}=\dfrac{2,76}{106}=0,026\left(mol\right)\)
Theo PT: \(n_{CH_3COOH}=2n_{Na_2CO_3}=0,052\left(mol\right)\Rightarrow V_{CH_3COOH}=\dfrac{0,052}{0,2}=0,26\left(l\right)\)
b, \(CO_2+Ca\left(OH\right)_2\rightarrow CaCO_{3\downarrow}+H_2O\)
Theo PT: \(n_{CaCO_3}=n_{CO_2}=n_{Na_2CO_3}=0,026\left(mol\right)\)
\(\Rightarrow m_{CaCO_3}=0,026.100=2,6\left(g\right)\)
\(a)n_{K_2CO_3}=\dfrac{2,76}{138}=0,02mol\\ K_2CO_3+2CH_3COOH\rightarrow2CH_3COOK+CO_2+H_2O\)
0,02 0,04 0,04 0,02 0,02
\(V_{ddCH_3COOH}=\dfrac{0,04}{0,2}=0,2l\\ b)n_{Ca\left(OH\right)_2}=2.0,0075=0,015mol\\ T=\dfrac{0,015}{0,02}=0,75\\ \Rightarrow0,5< T< 1\)
Tạo 2 muối
\(n_{CaCO_3}=a;n_{Ca\left(HCO_3\right)_2}=b\\ Ca\left(OH\right)_2+CO_2\rightarrow CaCO_3+H_2O\)
a a a a
\(Ca\left(OH\right)_2+2CO_2\rightarrow Ca\left(HCO_3\right)_2\)
b 2b b
\(\Rightarrow\left\{{}\begin{matrix}a+b=0,015\\a+2b=0,02\end{matrix}\right.\\ \Rightarrow a=0,01;b=0,005\\ m_{CaCO_3}=0,01.100=1g\)
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)
a) \(n_{Na_2CO_3}=\dfrac{21,2}{106}=0,2\left(mol\right)\)
PTHH: Na2CO3 + 2CH3COOH --> 2CH3COONa + CO2 + H2O
0,2--------->0,4--------------->0,4------->0,2
=> VCO2 = 0,2.22,4 = 4,48 (l)
b) \(m_{dd.CH_3COOH}=\dfrac{0,4.60}{12\%}=200\left(g\right)\)
c) mdd sau pư = 21,2 + 200 - 0,2.44 = 212,4 (g)
=> \(C\%_{muối}=\dfrac{0,4.82}{212,4}.100\%=15,44\%\)
a)
\(n_{Na_2CO_3}=\dfrac{10,6}{106}=0,1\left(mol\right)\)
PTHH: Na2CO3 + 2CH3COOH --> 2CH3COONa + CO2 + H2O
0,1--------->0,2------------->0,2------------>0,1
=> mCH3COOH = 0,2.60 = 12 (g)
\(C_{M\left(dd.CH_3COOH\right)}=\dfrac{0,2}{0,4}=0,5M\)
b) \(n_{C_2H_5OH}=\dfrac{13,8}{46}=0,3\left(mol\right)\)
PTHH: CH3COOH + C2H5OH --H2SO4,to--> CH3COOC2H5 + H2O
Xét tỉ lệ: \(\dfrac{0,2}{1}< \dfrac{0,3}{1}\) => Hiệu suất tính theo CH3COOH
\(n_{CH_3COOH\left(pư\right)}=\dfrac{0,2.80}{100}=0,16\left(mol\right)\)
PTHH: CH3COOH + C2H5OH --H2SO4,to--> CH3COOC2H5 + H2O
0,16------------------------------------->0,16
=> \(m_{CH_3COOC_2H_5}=0,16.88=14,08\left(g\right)\)
nNa2CO3 = 10,6 / 106 = 0,1 (mol)
Na2CO3 + 2CH3COOH -> 2CH3COONa + H2O + CO2
0,1 0,2 0,2 0,1
mdd CH3COOH = 0,2 * 60 / 5 * 100 = 240 (gam)
CO2 + Ca(OH)2 -> CaCO3 + H2O
0,1 0,1
mCaCO3 = 0,1 * 100 = 10 (gam)
mdd = 240 + 10,6 - 0,1 * 44 = 246,2 (gam)
C% = 82 * 0,2 / 246,2 * 100% = 6,66%
\(n_{Na_2CO_3}=\dfrac{10,6}{106}=0,1\left(mol\right)\)
PTHH:
Na2CO3 + 2CH3COOH ---> 2CH3COONa + CO2 + H2O
0,1---------->0,2----------------->0,2--------------->0,1
CO2 + Ca(OH)2 ---> CaCO3 + H2O
0,1------------------------->0,1
=> \(\left\{{}\begin{matrix}m_{ddCH_3COOH}=\dfrac{0,2.60}{5\%}=240\left(g\right)\\m_{CaCO_3}=0,1.100=10\left(g\right)\end{matrix}\right.\)
\(m_{dd}=10,6+240-0,1.44=246,2\left(g\right)\\ C\%_{CH_3COONa}=\dfrac{82.0,2}{246,2}.100\%=6,66\%\)