\(n_{Fe}=\dfrac{36,4}{56}=0,65\left(mol\right)\)

PTHH: Fe + 2HCl ---> FeCl₂ + H₂

           0,65->1,3----->0,65--->0,65

=> \(\left\{{}\begin{matrix}a,V_{ddHCl}=\dfrac{1,3}{0,5}=2,6\left(l\right)\\b,V_{H_2}=0,65.22,4=14,56\left(l\right)\end{matrix}\right.\)

c, \(C_{M\left(FeCl_2\right)}=\dfrac{0,65}{2,6}=0,25M\)

\(n_{Mg}=\dfrac{4,8}{24}=0,2\left(mol\right)\\ a.Mg+2HCl\rightarrow MgCl_2+H_2\\ n_{H_2}=n_{MgCl_2}=n_{Mg}=0,2\left(mol\right)\\ V_{H_2\left(đktc\right)}=0,2.22,4=4,48\left(l\right)\\ b.n_{HCl}=0,2.2=0,4\left(mol\right)\\ m_{ddHCl}=\dfrac{0,4.36,5.100}{7,3}=200\left(g\right)\\ c.m_{ddsau}=4,8+200-0,2.2=204,4\left(g\right)\\ C\%_{ddMgCl_2}=\dfrac{0,2.95}{204,4}.100\approx9,295\%\\ d.V_{ddHCl}=\dfrac{200}{1,05}=\dfrac{4000}{21}\left(ml\right)=\dfrac{4}{21}\left(l\right)\\ C_{MddHCl}=\dfrac{0,4}{\dfrac{4}{21}}=2,1\left(M\right)\)

`a)PTHH:`

  `Zn + 2HCl -> ZnCl_2 + H_2`

`0,02`                       `0,02`    `0,02`        `(mol)`

`n_[Zn]=[1,3]/65=0,02(mol)`

`b)V_[H_2]=0,02.22,4=0,448(l)`

`c)C%_[ZnCl_2]=[0,02.136]/[1,3+50-0,02.2].100~~5,31%`

\(n_{Zn}=\dfrac{1,3}{65}=0,02\left(mol\right)\)

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

0,02   0,04         0,02       0,02  ( mol )

\(V_{H_2}=0,02.22,4=0,448\left(l\right)\)

\(C\%_{ZnCl_2}=\dfrac{0,02.136}{1,3+50-0,02.2}.100=5,3\%\)

\(a)Zn+2HCl\rightarrow ZnCl_2+H_2\\ b)n_{Zn}=\dfrac{13}{65}=0,2mol\\ n_{Zn}=n_{ZnCl_2}=n_{H_2}=0,2mol\\ V_{H_2}=0,2.22,4=4,48l\\ c)n_{HCl}=0,2.2=0,4mol\\ C_{M_{HCl}}=\dfrac{0,4}{0,2}=2M\\ d)m_{ZnCl_2}=0,2.136=27,2g\)

a) pt: 2Al + 6HCl \(\rightarrow\) 2AlCl₃ + 3H₂

nAl = \(\dfrac{5,4}{27}=0,2mol\)

Theo pt: nH₂ = \(\dfrac{3}{2}nAl=0,3mol\)

=> VH₂ = 0,3.22,4 = 6,72lit

c) nHCl = 3nAl = 0,6mol

=> mHCl = 21,9g

=> C% = \(\dfrac{21,9}{200}.100\%=10,95\%\)

d) Bảo toàn khối lượng

mdung dich muối = mAl + mHCl - mH2

= 5,4 + 200 - 0,3.2 = 204,8g

Theo pt:nAlCl_3 ⁼ nAl = 0,2mol

=> mAlCl₃ = 0,2.133,5 = 26,7g

=> C%dd muối = \(\dfrac{26,7}{204,8}.100\%=13,03\%\)

e) H₂ + CuO \(\xrightarrow[]{t^o}\) Cu + H₂O

nCu = nH₂ = 0,3mol

=> mCu = 0,3.64 = 19,2g

ở ngoài ko thấy chỗ C% nên ấn vào câu hỏi mới ra nha

a, \(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\)

PTHH: Zn + 2HCl ---> ZnCl₂ + H₂

           0,1--->0,2------->0,1----->0,1

V_H2 = 0,1.22,4 = 2,24 (l)

b, \(C_{M\left(HCl\right)}=\dfrac{0,2}{0,2}=1M\)

c, \(C_{M\left(ZnCl_2\right)}=\dfrac{0,1}{0,2}=0,5M\)

a, \(Zn+2HCl\rightarrow ZnCl_2+H_2\)

b, \(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\)

\(m_{HCl}=100.14,6\%=14,6\left(g\right)\Rightarrow n_{HCl}=\dfrac{14,6}{36,5}=0,4\left(mol\right)\)

Xét tỉ lệ: \(\dfrac{0,1}{1}< \dfrac{0,4}{2}\), ta được HCl dư.

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, Theo PT: \(\left\{{}\begin{matrix}n_{HCl\left(pư\right)}=2n_{Zn}=0,2\left(mol\right)\\n_{ZnCl_2}=n_{Zn}=0,1\left(mol\right)\end{matrix}\right.\)

\(\Rightarrow n_{HCl\left(dư\right)}=0,4-0,2=0,2\left(mol\right)\)

Ta có: m _{dd sau pư} = 6,5 + 100 - 0,1.2 = 106,3 (g)

\(\Rightarrow\left\{{}\begin{matrix}C\%_{ZnCl_2}=\dfrac{0,1.136}{106,3}.100\%\approx12,79\%\\C\%_{HCl\left(dư\right)}=\dfrac{0,2.36,5}{106,3}.100\%\approx6,87\%\end{matrix}\right.\)

Em cảm ơn idol

a)

$n_{Al} = \dfrac{8,1}{27} = 0,3(mol)$

$2Al + 6HCl \to 2AlCl_3 + 3H_2$
Theo PTHH : 

$n_{H_2} = \dfrac{3}{2}n_{Al} = 0,45(mol)$
$V_{H_2} = 0,45.22,4 = 10,08(lít)$

b) $n_{HCl} = 3n_{Al} = 0,9(mol)$
$\Rightarrow m_{dd\ HCl} = \dfrac{0,9.36,5}{3,65\%} = 900(gam)$

c)

$m_{dd\ sau\ pư}= 8,1 + 900 - 0,45.2 = 907,2(gam)$

$n_{Al_2(SO_4)_3} = \dfrac{1}{2}n_{Al} = 0,15(mol)$
$C\%_{Al_2(SO_4)_3} = \dfrac{0,15.342}{907,2}.100\% = 5,65\%$

a) Zn + 2HCl → ZnCl2 + H2

b) n H2 = n Zn = 1,95/65 = 0,03(mol)

V H2 = 0,03.22,4 = 0,672(lít)

c) n ZnCl2 = n Zn = 0,03(mol)

=> m dd sau pư = 1,95 + 120 - 0,03.2 = 121,89(gam)

C% ZnCl2 = 0,03.136/121,89  .100% = 3,35%

a) nZn=0,03(mol)

PTHH: Zn +  2 HCl -> ZnCl2 + H2

nH2=nZnCl2=nZn=0,03(mol)

b) V(H2,đktc)=0,03.22,4=0,672(l)

c) mZnCl2=136.0,03=4,08(g)

mddA=mddZnCl2=1,95+ 120 - 0,03.2= 121,89(g)

=> C%ddZnCl2=(4,08/121,89).100=3,347%