nZn = 3,25/65=0,05 mol

2Zn + 2CH3COOH --> 2CH3COOZn + H2

0,05      0,05                   0,05               0,025            mol

=> VH2= 0,025*22,4=0,56 lít

mdd=(0,05*60*100)/20=15 g

b)mCH3COOZn = 0,05*124=6,2 g

Mg+2CH3COOH->(CH3COO)2Mg +H2

0,2------0,4--------------------0,2------------------0,2

nH2=0,2 mol

mMg=0,2.24=4,8g

NaOH+CH3COOH->CH3COONa+H2O

0,4-----------0,4 

Vdd=0,4/0,5=0,8l

B học trường nào đấy

a/ PTHH:

\(2CH_3COOH+Zn\rightarrow\left(CH_3COO\right)_2Zn+H_2\uparrow\)

0,9 <---- 0,45 <----- 0,45 <---- 0,45

\(n_{H_2}=\dfrac{10,08}{22,4}=0,45\left(mol\right)\)

\(m_{Zn}=0,45.65=29,25\left(g\right)\)

b/ \(C_{MddCH_3COOH}=\dfrac{0,9}{0,2}=4,5\left(M\right)\)

c/ \(CH_3COOH+NaOH\rightarrow CH_3COONa+H_2O\)

0,9 ----> 0,9 ----> 0,9

\(V_{ddNaOH}=\dfrac{0,9}{2}=0,45\left(l\right)\)

\(V_{ddCH_3COONa}=0,2+0,45=0,65\left(l\right)\)

\(C_{MddCH_3COONa}=\dfrac{0,9}{0,65}=1,385\left(M\right)\)

$a\big)$

$Zn+2CH_3COOH\to (CH_3COO)_2Zn+H_2$

$ZnO+2CH_3COOH\to (CH_2COO)_2Zn+H_2O$

Theo PT: $n_{Zn}=n_{H_2}=\frac{4,48}{22,4}=0,2(mol)$

$\to \%m_{Zn}=\frac{0,2.65}{21,1}.100\%\approx 61,61\%$

$\to \%m_{ZnO}=100-61,61=38,39\%$

$b\big)$

$n_{ZnO}=\frac{21,1-0,2.65}{81}=0,1(mol)$

Theo PT: $\sum n_{CH_3COOH}=2n_{Zn}+2n_{ZnO}=0,6(mol)$

$\to C_{M_{CH_3COOH}}=\dfrac{0,6}{\frac{200}{1000}}=3M$

\(n_{H_2}=\dfrac{4,48}{22,4}=0,2mol\)

\(Zn+2CH_3COOH\rightarrow\left(CH_3COO\right)_2Zn+H_2\)

 0,2                                                                0,2     ( mol )

\(m_{Zn}=0,2.65=13g\)

\(\%m_{Zn}=\dfrac{13}{21,1}.100=61,61\%\)

\(\%m_{ZnO}=100\%-61,61\%=38,39\%\)

\(Zn+2CH_3COOH\rightarrow\left(CH_3COO\right)_2Zn+H_2\)

0,2               0,4                                                  ( mol )

\(n_{ZnO}=\dfrac{21,1-13}{81}=0,1mol\)

\(ZnO+2CH_3COOH\rightarrow\left(CH_3COO\right)_2Zn+H_2O\)

 0,1              0,2                                                        ( mol )

\(C_{M\left(CH_3COOH\right)}=\dfrac{0,4+0,2}{0,2}=3M\)

2CH3COOH + Zn -- > (CH3COOH)2Zn + H2

nH2 = 2,24 / 22,4 = 0,1 (mol)

=> nCH3COOH = 0,2 (mol)

mZn = 0,1. 65 = 6,5 (g)

mH2 = 0,1.2 = 0,2 (g)

mdd  = 300 + 6,5 - 0,2 = 306,3 (g)

mCH3COOH = 0,2 . 60 = 12 (g)

=> C%CH3COOH = ( 12.100 ) / 306,3 = 4%

m(CH3COO)2Zn = 0,1 . 183 = 18,3 (g)

=> (18,3.100) / 306,3 = 6%

Sửa đề cho dễ làm : dd K₂CO₃ 13,8%

PTHH: \(2CH_3COOH+K_2CO_3\rightarrow2CH_3COOK+H_2O+CO_2\uparrow\)

a+b) Ta có: \(n_{CH_3COOH}=\dfrac{150\cdot12\%}{60}=0,3\left(mol\right)\)

\(\Rightarrow n_{K_2CO_3}=n_{CO_2}=0,15\left(mol\right)\) \(\Rightarrow\left\{{}\begin{matrix}m_{ddK_2CO_3}=\dfrac{0,15\cdot138}{13,8\%}=150\left(g\right)\\V_{CO_2}=0,15\cdot22,4=3,36\left(l\right)\end{matrix}\right.\)

c) Theo PTHH:: \(n_{CH_3COOK}=0,3\left(mol\right)\) \(\Rightarrow m_{CH_3COOK}=0,3\cdot98=29,4\left(g\right)\)

Mặt khác: \(m_{CO_2}=0,15\cdot44=6,6\left(g\right)\)

\(\Rightarrow m_{dd}=m_{ddCH_3COOH}+m_{ddK_2CO_3}-m_{CO_2}=293,4\left(g\right)\)

\(\Rightarrow C\%_{CH_3COOK}=\dfrac{29,4}{293,4}\cdot100\%\approx10,02\%\)

a) $Zn + 2HCl \to ZnCl_2 + H_2$

b) n Zn = n H2 = 4,48/22,4 = 0,2(mol)

m Zn = 0,2.65 = 13(gam)

c) n HCl = 2n H2 = 0,4(mol)

=> C% HCl = 0,4.36,5/200 .100% = 7,3%

Gọi \(n_{Fe}=x\left(mol\right)\)\(;n_{Zn}=y\left(mol\right)\)

\(n_{H_2}=\dfrac{6,72}{22,4}=0,3mol\)

Ta có:  \(\left\{{}\begin{matrix}56x+65y=18,6\\2x+2y=2n_{H_2}=0,6\end{matrix}\right.\)\(\Rightarrow\left\{{}\begin{matrix}x=0,1\\y=0,2\end{matrix}\right.\)

\(\%m_{Fe}=\dfrac{0,1\cdot56}{18,6}\cdot100\%=30,11\%\)

\(\%m_{Zn}=100\%-30,11\%=69,89\%\)

\(Fe+2HCl\rightarrow FeCl_2+H_2\)

0,1     0,2

\(Zn+2HCl\rightarrow ZnCl_2+H_2\)

0,2     0,4

\(n_{HCl}=0,2+0,4=0,6mol\)

\(C_M=\dfrac{n}{V}=\dfrac{0,6}{0,2}=3M\)