cho 6,5 gam Zn tác dụng vừa đủ với dd CH3COOH 12%.Tính tỉ khối dd CH3COOH đã dùng
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10 tháng 5 2021
a)
$CH_3COOH + NaHCO_3 \to CH_3COONa + CO_2 + H_2O$
b)
n NaHCO3 = n CH3COOH = 100.12%/60 = 0,2(mol)
m dd NaHCO3 = 0,2.84/8% = 210(gam)
c)
n CO2 = n CH3COOH = 0,2(mol)
=> V CO2 = 0,2.22,4 = 4,48(lít)
d)
m dd = m dd CH3COOH + m dd NaHCO3 - m CO2 = 100 + 210 - 0,2.44 = 301,2(gam)
C% CH3COONa = 0,2.82/301,2 .100% = 5,44%
20 tháng 4 2023
Ta có: \(n_{NaOH}=0,1.0,5=0,05\left(mol\right)\)
PT: \(CH_3COOH+NaOH\rightarrow CH_3COONa+H_2O\)
Theo PT: \(n_{CH_3COOH}=n_{CH_3COONa}=n_{NaOH}=0,05\left(mol\right)\)
a, \(C_{M_{CH_3COOH}}=\dfrac{0,05}{0,2}=0,25\left(M\right)\)
b, \(m_{CH_3COONa}=0,05.82=4,1\left(g\right)\)
5 tháng 4 2023
a, \(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\)
PT: \(2CH_3COOH+Zn\rightarrow\left(CH_3COO\right)_2Zn+H_2\)
Theo PT: \(n_{H_2}=n_{Zn}=0,1\left(mol\right)\Rightarrow V_{H_2}=0,1.22,4=2,24\left(l\right)\)
b, \(n_{\left(CH_3COO\right)_2Zn}=n_{Zn}=0,1\left(mol\right)\Rightarrow m_{\left(CH_3COO\right)_2Zn}=0,1.183=18,3\left(g\right)\)
c, \(n_{CH_3COOH}=2n_{Zn}=0,2\left(mol\right)\)
\(\Rightarrow m_{CH_3COOH}=0,2.60=12\left(g\right)\)
\(\Rightarrow m_{ddCH_3COOH}=\dfrac{12}{60\%}=20\left(g\right)\)
6 tháng 5 2023
\(m_{CH_3COOH}=\dfrac{80.9}{100}=7,2\left(g\right)\)
\(n_{CH_3COOH}=\dfrac{7,2}{60}=0,12\left(mol\right)\)
PTHH :
\(15CH_3COOH+10NaHCO_3\rightarrow10CH_3COONa+2H_2O+20CO_2\uparrow\)
0,12 0,08 0,08 0,016 0,16
\(a,m_{NaHCO_3}=84.0,08=6,72\left(g\right)\)
\(m_{ddNaHCO_3}=\dfrac{6,72.100}{4,2}=160\left(g\right)\)
\(b,m_{CH_3COONa}=0,08.82=6,56\left(g\right)\)
\(m_{H_2O}=0,016.18=0,288\left(g\right)\)
\(m_{CO_2}=0,16.44=7,04\left(g\right)\)
\(m_{ddCH_3COONa}=80+160-0,288-7,04=232,672\left(g\right)\)
\(C\%=\dfrac{6,56}{232,672}\approx2,82\%\)
9 tháng 4 2023
a, \(n_{CO_2}=\dfrac{2,479}{24,79}=0,1\left(mol\right)\)
PT: \(MgO+2CH_3COOH\rightarrow\left(CH_3COO\right)_2Mg+H_2O\)
\(MgCO_3+2CH_3COOH\rightarrow\left(CH_3COO\right)_2Mg+CO_2+H_2O\)
Theo PT: \(n_{MgCO_3}=n_{CO_2}=0,1\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}\%m_{MgCO_3}=\dfrac{0,1.84}{10,4}.100\%\approx80,77\%\\\%m_{MgO}\approx19,23\%\end{matrix}\right.\)
b, \(n_{MgO}=\dfrac{10,4-0,1.84}{40}=0,05\left(mol\right)\)
Theo PT: \(n_{CH_3COOH}=2n_{MgO}+2n_{MgCO_3}=0,3\left(mol\right)\)
\(\Rightarrow C_{M_{CH_3COOH}}=\dfrac{0,3}{0,2}=1,5\left(M\right)\)
1 tháng 5 2022
a)
\(n_{CO_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)
PTHH: Na2CO3 + 2CH3COOH --> 2CH3COONa + CO2 + H2O
0,15<---------0,3<------------------------0,15
=> \(C\%_{dd.CH_3COOH}=\dfrac{0,3.60}{200}.100\%=9\%\)
b)
\(m_{dd.Na_2CO_3}=\dfrac{0,15.106.100}{15}=106\left(g\right)\)
c)
PTHH: 2CH3COOH + Ba(OH)2 --> (CH3COO)2Ba + 2H2O
0,3--------->0,15
=> \(V_{dd.Ba\left(OH\right)_2}=\dfrac{0,15}{0,5}=0,3\left(l\right)=300\left(ml\right)\)
25 tháng 3 2022
Bài 1:
nCH3COOH = 0,08.1,5 = 0,12 (mol)
PTHH: CH3COOH + C2H5OH --H+,to--> CH3COOC2H5 + H2O
0,12----------------------------->0,12
=> mCH3COOC2H5 = 0,12.88 = 10,56 (g)
Bài 2:
nCH3COOH = 2.0,1 = 0,2 (mol)
PTHH: 2CH3COOH + Mg --> (CH3COO)2Mg + H2
0,2------->0,1----------------------->0,1
=> mMg = 0,1.24 = 2,4 (g)
PTHH: C2H4 + H2 --to,Ni--> C2H6
0,1<--0,1
=> VC2H4(đktc) = 0,1.22,4 = 2,24 (l)
30 tháng 3 2022
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
=> \(m_{CH_3COOC_2H_5}=0,16.88=14,08\left(g\right)\)
Zn + 2CH3COOH => (CH3COO)2Zn + H2
nZn = m/M = 6.5/65 = 0.1 (mol)
Theo pt =>> nCH3COOH = 0.2 (mol)
==> mCH3COOH = n.M = 0.2 x 60 = 12 (g)
mdd = 12x100/12 = 100 (g)