\(a,n_{\left(CH_3COO\right)_2Mg}=\dfrac{7,1}{142}=0,05\left(mol\right)\)

PTHH: \(Mg+2CH_3COOH\rightarrow\left(CH_3COO\right)_2Mg+H_2\uparrow\)

                        0,1<----------------0,05-------------->0,05

\(\rightarrow V_{H_2}=0,05.22,4=1,12\left(l\right)\\ b,C\%_{CH_3COOH}=\dfrac{0,1.60}{100}.100\%=6\%\)

\(c,n_{C_2H_5OH}=\dfrac{6,9}{46}=0,15\left(mol\right)\)

PTHH: \(CH_3COOH+C_2H_5OH\xrightarrow[H_2SO_{4\left(đặc\right)}]{t^o}CH_3COOC_2H_5+H_2O\)

bđ          0,1                 0,15

pư          0,1                 0,1

spư         0                     0,05                          0,1

\(\rightarrow m_{este}=0,1.80\%.88=7,04\left(g\right)\)

Zn+2HCl→ZnCl2+H2

 2Al+6HCl→2AlCl3+3H2

Gọi số mol HCllà x

n H2=\(\dfrac{1}{2}\)n HCl=0,5x

Bảo toàn khối lượng: mkl+mHCl=mmuối+mH2

6,05+36,5x=13,15+0,5x.2

→x=0,2 mol

mHCl=0,2.36,5=7,3 gam

=>m =mddHCl=\(\dfrac{7,3}{10\%}\)=73gam

\(n_{HCl}=\dfrac{150.3,65\%}{36,5}=0,15\left(mol\right)\\ a.Fe+2HCl\rightarrow FeCl_2+H_2\\ b.n_{H_2}=\dfrac{0,15}{2}=0,075\left(mol\right)\\ V_{H_2\left(đktc\right)}=0,075.22,4=1,68\left(l\right)\)

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

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

\(n_{Zn}=\dfrac{13}{65}=0,2mol\)

\(m_{HCl}=21,9g\Rightarrow n_{HCl}=\dfrac{21,9}{36,5}=0,6\)

=> HCl dư

\(\Rightarrow n_{H_2}=0,2mol\)

\(\Rightarrow V_{H_2}=0,2.22,4=4,48l\)

bổ sung ý b)

Khối lượng dung dịch sau phản ứng = mZn + mHCl - mH₂ thoát ra = 13 +150 - 0,2 .2 = 162,6 gam

Dung dịch thu được sau phản ứng gồm \(\left\{{}\begin{matrix}ZnCl_2\\HCl_{dư}\end{matrix}\right.\)

nZnCl₂ = nZn = 0,2 mol => mZnCl₂ = 0,2 . 136 = 27,2 gam

=> C% ZnCl₂ = \(\dfrac{27,2}{162,6}\).100= 16,72%

nHCl dư = 0,6 - 0,4 = 0,2 mol 

mHCl dư= 0,2.36,5 = 7,3 gam

=> C% HCl dư = \(\dfrac{7,3}{162,6}\).100 = 4,5%

\(n_{H_2}=\dfrac{3,36}{22,4}0,15(mol)\\ a,PTHH:Fe+H_2SO_4\to FeSO_4+H_2\\ b,n_{Fe}=n_{H_2}=0,15(mol)\\ \Rightarrow \%_{Fe}=\dfrac{0,15.56}{14,8}.100\%=56,76\%\\ \Rightarrow \%_{Cu}=100\%-56,76\%=43,24\%\\ c,n_{H_2SO_4}=0,15(mol)\\ \Rightarrow m_{dd_{H_2SO_4}}=\dfrac{0,15.98}{20\%}=73,5(g)\\ \Rightarrow V_{dd_{H_2SO_4}}=\dfrac{73,5}{1,4}=52,5(l)\)