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

=> \(V_{dd.Ba\left(OH\right)_2}=\dfrac{0,15}{0,5}=0,3\left(l\right)=300\left(ml\right)\)

CH3COOH+NaHCO3->CH3COONa+H2O+CO2

0,1----------------0,1-------------------0,1--------------0,1

n CO2=0,1 mol

=>C% axit=\(\dfrac{0,1.60}{200}.100\)=3%

m NaHCO3=0,1.84=8,4g

c) C% CH3COONa=\(\dfrac{0,1.82}{200+8,4}.100=3,934\%\)

a) \(n_{CH_3COOH}=\dfrac{120.20\%}{60}=0,4\left(mol\right)\)

\(n_{Na_2CO_3}=\dfrac{53.30\%}{106}=0,15\left(mol\right)\)

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

Xét tỉ lệ: \(\dfrac{0,15}{1}< \dfrac{0,4}{2}\) => Na₂CO₃ hết, CH₃COOH dư

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

                0,15-------->0,3-------------->0,3------->0,15

=> \(m_{CH_3COONa}=0,3.82=24,6\left(g\right)\)

b) m_{dd sau pư} = 120 + 53 - 0,15.44 = 166,4 (g)

=> \(C\%=\dfrac{24,6}{166,4}.100\%=14,78\text{%}\)

\(a,PTHH:3NaOH+FeCl_3\rightarrow3NaCl+Fe\left(OH\right)_3\downarrow\\ 2Fe\left(OH\right)_3\rightarrow^{t^o}Fe_2O_3+3H_2O\uparrow\\ b,n_{FeCl_3}=1,5\cdot0,2=0,3\left(mol\right)\\ \Rightarrow n_{NaOH}=3n_{FeCl_3}=0,9\left(mol\right)\\ \Rightarrow V_{dd_{NaOH}}=\dfrac{0,9}{2}=0,45\left(l\right)\)

Theo đề: \(\left\{{}\begin{matrix}X:Fe\left(OH\right)_3\\A:NaCl\\Y:Fe_2O_3\end{matrix}\right.\)

Theo PT: \(n_{NaCl}=3n_{FeCl_3}=0,9\left(mol\right)\)

\(\Rightarrow C_{M_{NaCl}}=\dfrac{0,9}{0,45+0,2}\approx1,4M\)

\(c,\) Theo PT: \(n_{Fe\left(OH\right)_3}=n_{FeCl_3}=0,3\left(mol\right);n_{Fe_2O_3}=\dfrac{1}{2}n_{Fe\left(OH\right)_3}=0,15\left(mol\right)\)

\(\Rightarrow\left\{{}\begin{matrix}m_X=m_{Fe\left(OH\right)_3}=0,3\cdot107=32,1\left(g\right)\\m_Y=m_{Fe_2O_3}=0,15\cdot160=24\left(g\right)\end{matrix}\right.\)

Bài 1:

\(a)Mg+2HCl\rightarrow MgCl_2+H_2\\ Mg+H_2SO_4\rightarrow MgSO_4+H_2\\ b)Zn+2HCl\rightarrow ZnCl_2+H_2\\ Zn+H_2SO_4\rightarrow ZnSO_4+H_2\)

Bài 2:

\(a)Fe+H_2SO_4\rightarrow FeSO_4+H_2\\ b)n_{H_2}=\dfrac{3,36}{22,4}=0,15mol\\ n_{Fe}=n_{H_2SO_4}=n_{H_2}=0,15mol\\ m_{Fe}=0,15.56=8,4g\\ c)C_{M_{H_2SO_4}}=\dfrac{0,15}{0,05}=3M\)

khó quá

\(n_{CH_3COOH}=0,1.0,1=0,01\left(mol\right)\)

PT: \(Na_2CO_3+2CH_3COOH\rightarrow2CH_3COONa+CO_2+H_2O\)

Theo PT: \(n_{CO_2}=\dfrac{1}{2}n_{CH_3COOH}=0,005\left(mol\right)\)

\(\Rightarrow V_{CO_2}=0,005.22,4=0,112\left(l\right)\)

Đáp án: A

a

\(n_{CH_3COOH}=0,1.0,1=0,01\left(mol\right)\\ Na_2CO_3+2CH_3COOH\rightarrow2CH_3COONa+CO_2+H_2O\\ n_{CO_2}=\dfrac{0,01}{2}=0,005\left(mol\right)\\ V_{CO_2\left(đktc\right)}=0,005.22,4=0,112\left(l\right)\\ Chọn.A\)

n_Na2CO3 = 10,6 : (23.2 +12 + 16.3) = 0,1

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

mol(đb): 0,2 : 0,1 : 0,2 : 0,1

a)=> V_CO2 = 0,1. 22,4 = 2.24(l)

b)=>m_CH3COOH = 0,2. 60 = 12 (g)

=> m_ddCH3COOH = 12 : 20 . 100 = 60(g)

=> m_{ddsau p/ứg}= 60 + 10,6 - (0,1 . 44)= 66,2 (g)

=> m_CH3COONa = 0,2 . 82 =16,4(g)

=> C%_{dd CH3COONa} = (16,4 : 66,2) . 100 = \(\dfrac{8200}{331}\)%

( BẠN XEM LẠI VÀ THAY A, B VÀO NHÉ )