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31 tháng 3 2019

CH3COOH + NaHCO3 => CH3COONa + CO2 + H2O

mCH3COOH = 100x12/100 = 12 (g)

==> nCH3COOH = m/M = 12/60 = 0.2 (mol)

Theo pt: => nNaHCO3 = 0.2 (mol)

==> mNaHCO3 = n.M = 0.2x84 =16.8 (g)

==> mdd NaHCO3 = 16.8x100/8.4 = 200 (g)

Ta có: nCH3COONa = 0.2 (mol)

==> mCH3COONa = n.M = 0.2 x 82 = 16.4 (g)

mdd sau pứ = 200 + 100 - 0.2 x 44 =291.2 (g)

C% = 16.4 x 100/ 291.2 = 5.63%

18 tháng 6 2020

Cho em hỏi 44 ở dòng gần cuối ở đâu ra vậy ạ??

18 tháng 4 2022

\(m_{CH_3COOH}=12\%.100=12\left(g\right)\\ n_{CH_3COOH}=\dfrac{12}{60}=0,2\left(mol\right)\)

PTHH: CH3COOH + NaOH ---> CH3COONa + H2O

               0,2--------->0,2------------>0,2

\(m_{NaOH}=0,2.40=8\left(g\right)\\ m_{ddNaOH}=\dfrac{8}{8,4\%}=\dfrac{2000}{21}\left(g\right)\\ m_{ddCH_3COONa}=\dfrac{2000}{21}+100=\dfrac{4100}{21}\left(g\right)\\ m_{CH_3COONa}=0,2.82=16,4\left(g\right)\\ C\%_{CH_3COONa}=\dfrac{16,4}{\dfrac{4100}{21}}.100\%=8,4\%\)

18 tháng 4 2022

`=>` Gợi ý:

`CH3COOH + NaHCO3 => CH3COONa + CO2 + H2O`

`mCH3COOH = 100x12/100 = 12` (g)

`==> nCH3COOH = m/M = 12/60 = 0.2` (mol)

Theo pt: `=> nNaHCO3 = 0.2` (mol)

`==> mNaHCO3 = n.M = 0.2x84 =16.8` (g)

`==> mdd NaHCO3 = 16.8x100/8.4 = 200` (g)

Ta có: `nCH3COONa = 0.2` (mol)

11 tháng 4 2023

a, \(m_{CH_3COOH}=100.6\%=6\left(g\right)\Rightarrow n_{CH_3COOH}=\dfrac{6}{60}=0,1\left(mol\right)\)

PT: \(CH_3COOH+NaHCO_3\rightarrow CH_3COONa+CO_2+H_2O\)

Theo PT: \(n_{NaHCO_3}=n_{CH_3COONa}=n_{CO_2}=n_{CH_3COOH}=0,1\left(mol\right)\)

\(\Rightarrow m_{NaHCO_3}=0,1.84=8,4\left(g\right)\)

\(V_{CO_2}=0,1.22,4=2,24\left(l\right)\)

b, Ta có: m dd sau pư = 100 + 8,4 - 0,1.44 = 104 (g)

\(\Rightarrow C\%_{CH_3COONa}=\dfrac{0,1.82}{104}.100\%\approx7,88\%\)

PTHH: \(CH_3COOH+KHCO_3\rightarrow CH_3COOK+H_2O+CO_2\uparrow\)

a) Ta có: \(n_{CH_3COOH}=\dfrac{200\cdot24\%}{60}=0,8\left(mol\right)=n_{KHCO_3}\)

\(\Rightarrow m_{ddKHCO_3}=\dfrac{0,8\cdot100}{16,8\%}\approx476.2\left(g\right)\)

b) Theo PTHH: \(n_{CH_3COOK}=0,8\left(mol\right)=n_{CO_2}\)

\(\Rightarrow\left\{{}\begin{matrix}m_{CH_3COOK}=0,8\cdot98=78,4\left(g\right)\\m_{CO_2}=0,8\cdot44=35,2\left(g\right)\end{matrix}\right.\)

 Mặt khác: \(m_{dd}=m_{ddCH_3COOH}+m_{ddKHCO_3}-m_{CO_2}=641\left(g\right)\)

\(\Rightarrow C\%_{CH_3COOK}=\dfrac{78,4}{641}\cdot100\%\approx12,23\%\)

 

1 tháng 5 2019

mCH3COOH= 150*6/100=9g

nCH3COOH= 9/60=0.15 mol

CH3COOH + NaHCO3 --> CH3COONa + CO2 + H2O

0.15_________0.15__________0.15______0.15

mNaHCO3= 0.15*84=12.6g

mdd NaHCO3= 12.6*100/8.4=150g

m dung dịch sau phản ứng=mdd CH3COOH + mdd NaHCO3 - mCO2= 150+150-0.15*44==293.4g

C%CH3COONa= 12.3/293.4*100%= 4.19%

1 tháng 5 2019

CH3COOH + NaHCO3 => CH3COONa + CO2 + H2O

mCH3COOH = 150 x 6/100 = 9 (g)

===> nCH3COOH = m/M = 9/60 = 0.15 (mol)

Theo phương trình ==> nNaHCO3 = 0.15 (mol)

mNaHCO3 = n.M = 0.15 x 84 = 12.6 (g)

===> mddNaHCO3 = 12.6 x 100/8.4 = 150 (g)

mdd sau pứ = 150 + 150 - 0.3 = 299.7 (g)

mCH3COONa = n.M = 0.15 x 82 = 12.3 (g)

C%ddCH3COONa = 4.104 %

20 tháng 12 2021

\(n_{Fe_2O_3}=\dfrac{8}{160}=0,05\left(mol\right)\)

PTHH: Fe2O3 + 3H2SO4 --> Fe2(SO4)3 + 3H2O

______0,05------>0,15--------->0,05

=> mH2SO4 = 0,15.98 = 14,7(g)

=> \(C\%\left(H_2SO_4\right)=\dfrac{14,7}{100}.100\%=14,7\%\)

\(C\%\left(Fe_2\left(SO_4\right)_3\right)=\dfrac{0,05.400}{8+100}.100\%=18,52\%\)

PTHH: Fe2(SO4)3 + 6NaOH --> 2Fe(OH)3\(\downarrow\) + 3Na2SO4

________0,05----------------------->0,1

=> mFe(OH)3 = 0,1.107=10,7(g)

21 tháng 4 2021

\(n_{FeO}=\dfrac{10.8}{72}=0.15\left(mol\right)\)

\(FeO+2HCl\rightarrow FeCl_2+H_2O\)

\(0.15.......0.3.............0.15\)

\(m_{HCl}=0.3\cdot36.5=10.95\left(g\right)\)

\(C\%HCl=\dfrac{10.95}{100}\cdot100\%=10.95\%\)

\(m_{dd}=10.8+100=110.8\left(g\right)\)

\(m_{FeCl_2}=0.15\cdot127=19.05\left(g\right)\)

\(C\%FeCl_2=\dfrac{19.05}{110.8}\cdot100\%=17.19\%\)

21 tháng 4 2021

nFeO=10.872=0.15(mol)nFeO=10.872=0.15(mol)

FeO+2HCl→FeCl2+H2OFeO+2HCl→FeCl2+H2O

0.15.......0.3.............0.150.15.......0.3.............0.15

mHCl=0.3⋅36.5=10.95(g)mHCl=0.3⋅36.5=10.95(g)

C%HCl=10.95100⋅100%=10.95%C%HCl=10.95100⋅100%=10.95%

mdd=10.8+100=110.8(g)mdd=10.8+100=110.8(g)

mFeCl2=0.15⋅127=19.05(g)mFeCl2=0.15⋅127=19.05(g)

C%FeCl2=19.05110.8⋅100%=17.19%C%FeCl2=19.05110.8⋅100%=17.19%

24 tháng 4 2021

nNaOH = 4/40 = 0.1 (mol)

PTHH: NaOH + HCl -> NaCl + H2O

Từ PTHH: nNaCl = nHCl = nNaOH = 0.1 (mol)

a) mNaCl = 0.1*(23+35.5) = 5.85(g)

b) mHCl = 0.1*(1+35.5) = 3.65(g)

C%ddHCl = 3.65/100 * 100% = 3.65%

10 tháng 5 2022

a) Na2CO3 + 2CH3COOH --> 2CH3COONa + CO2 + H2O

b) \(n_{CH_3COOH}=\dfrac{25.6\%}{60}=0,025\left(mol\right)\)

PTHH: Na2CO3 + 2CH3COOH --> 2CH3COONa + CO2 + H2O

              0,0125<-----0,025------------>0,025------>0,0125

=> \(m_{Na_2CO_3}=0,0125.106=1,325\left(g\right)\)

c) \(m_{dd.sau.pư}=1,325+25-0,0125.44=25,775\left(g\right)\)

\(C\%_{dd.CH_3COONa}=\dfrac{0,025.82}{25,775}.100\%=7,95\%\)

10 tháng 5 2022

m CH3COOH=1,5g=>n=0,025 mol

2CH3COOH+Na2CO3->2CH3COONa+H2O+CO2

0,025--------------0,0125----------0,025

=>m Na2CO3=0,0125.106=1,325g

=>mdd=25g

c) 

C% =\(\dfrac{0,025.82}{25+25}100=4,1\%\)