\(n_{H_2}=\dfrac{6.72}{22.4}=0.3\left(mol\right)\)

\(\Rightarrow n_{HCl}=2\cdot n_{H_2}=2\cdot0.3=0.6\left(mol\right)\)

BTKL : 

\(m_{Muối}=m_{hh}+m_{HCl}-m_{H_2}=18.6+0.6\cdot36.5-0.3\cdot2=39.9\left(g\right)\)

\(Đặt:\left\{{}\begin{matrix}Fe:x\left(mol\right)\\Zn:y\left(mol\right)\end{matrix}\right.\\ Fe+2HCl\rightarrow FeCl_2+H_2\\ Zn+2HCl\rightarrow ZnCl_2+H_2\\ Tacó:\left\{{}\begin{matrix}56x+65y=5,3\\x+y=0,25\end{matrix}\right.\\ \Rightarrow\left\{{}\begin{matrix}x=1,2\\y=-0,97\end{matrix}\right.\left(vô\:lí\right)\)

Em xem lại đề nha!

\(n_{Zn}=\dfrac{13}{65}=0.2\left(mol\right)\)

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

\(0.2....................0.2..........0.2\)

\(m_{ZnCl_2}=0.2\cdot136=27.2\left(g\right)\)

\(V_{H_2}=0.2\cdot22.4=4.48\left(l\right)\)

Ulatr thanks mn nhìu ♥️

nH2= 0,3(mol)

PTHH: Mg +2HCl -> MgCl2 + H2

x_______2x______x_______x(mol)

Zn +2 HCl -> ZnCl2 + H2

y____2y____y______y(mol)

Ta có hpt:  \(\left\{{}\begin{matrix}24x+65y=11,3\\x+y=0,3\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=0,2\\y=0,1\end{matrix}\right.\)

=> m(muối)= mMgCl2+ mZnCl2= 95x+136y=95.0,2+136.0,1=32,6(g)

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

\(\Rightarrow n_H=0,6mol=n_{HCl}\) 

\(\Rightarrow m_{Cl}=0,6.35,5=21,3g\)

\(\Rightarrow m_M=m_{KL}+m_{Cl}=11,3+21,3=32,6g\)

\(a) Zn + 2HCl \to ZnCl_2 + H_2\\ b) n_{HCl} = 0,12.1,5 = 0,18(mol)\\ n_{Zn} = \dfrac{1}{2}n_{Zn} = 0,09(mol)\\ m_{Zn} = 0,09.65 = 5,85(gam)\)

\(a.Zn+2HCl\rightarrow ZnCl_2+H_2\\ n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right);n_{HCl}=\dfrac{18,25}{36,5}=0,5\left(mol\right)\\ LTL:\dfrac{0,2}{1}< \dfrac{0,5}{2}\Rightarrow HCldư\\ n_{HCl\left(pứ\right)}=2n_{Zn}=0,4\left(mol\right)\\\Rightarrow m_{HCl\left(dư\right)}=\left(0,5-0,4\right).36,5=3,65\left(g\right)\\ b.n_{ZnCl_2}=n_{Zn}=0,2\left(mol\right)\\ \Rightarrow m_{ZnCl_2}=0,2.136=27,2\left(g\right)\\ c.n_{H_2}=n_{Zn}=0,2\left(mol\right)\\ \Rightarrow V_{H_2}=0,2.22,4,=4,48\left(l\right)\\ d.3H_2+Fe_2O_3-^{t^o}\rightarrow2Fe+3H_2O \\ n_{Fe_2O_3}=\dfrac{19,2}{160}=0,12\left(mol\right)\\ LTL:\dfrac{0,2}{3}< \dfrac{0,12}{1}\Rightarrow Fe_2O_3dưsauphảnứng\\ \Rightarrow n_{Fe}=\dfrac{2}{3}n_{H_2}=\dfrac{2}{15}\left(mol\right)\\ \Rightarrow m_{Fe}=\dfrac{2}{15}.56=7,467\left(g\right)\)

a) n\(Zn\)=\(\dfrac{m}{M}\)=\(\dfrac{13}{65}\)=0,2(mol)

n\(HCl\)=\(\dfrac{m}{M}\)=\(\dfrac{18,25}{36,5}=\)0,5(mol)

PTHH : Zn + 2HCl->ZnCl\(2\) + H\(2\)

            0,2     0,5

Lập tỉ lệ mol : \(^{\dfrac{0,2}{1}}\)<\(\dfrac{0,5}{2}\)

n\(Zn\) hết , n\(HCl\) dư

-->Tính theo số mol hết

               Zn + 2HCl->ZnCl\(2\) + H\(2\)

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

n\(HCl\) dư= n\(HCl\)(đề) - n\(HCl\)(pt)= 0,5 - 0,4 = 0,1(mol)

m​\(HCl\) dư= 0,1.36,5 = 3,65(g)

b) m\(ZnCl2\) = n.M= 0,2.136= 27,2 (g)

c)V\(H2\)=n.22,4=0,2.22,4=4,48(l)

d) n\(Fe\)\(2\)O\(3\)=\(\dfrac{m}{M}\)=\(\dfrac{19,2}{160}\)=0,12 (mol)

 3H2 +Fe2O3 → 2Fe + 3H2O

  0,2       0,12

Lập tỉ lệ mol: \(\dfrac{0,2}{3}\)<\(\dfrac{0,12}{1}\)

    nH2 hết .Tính theo số mol hết

\(HCl\)

​ 3H2 +Fe2O3 → 2Fe + 3H2O

0,2->                  0,2

m\(Fe\)=n.M= 0,2.56= 11,2(g)

\(n_{Zn}=\dfrac{13}{65}=0,2(mol)\\ a,PTHH:Zn+2HCl\to ZnCl_2+H_2\\ b,n_{HCl}=2n_{Zn}=0,4(mol)\\ \Rightarrow m_{HCl}=0,4.36,5=14,6(g)\\ c,n_{H_2}=n_{Zn}=0,2(mol)\\ \Rightarrow V_{H_2}=0,2.22,4=4,48(l)\)

b) mHCl = 14,6 (g)

V H2 = 4,48 (l)

Giải thích các bước:

a) PTHH:  Zn +  2HCl → ZnCl2 + H2↑

b) nZn = 13 : 65 = 0,2 mol

Theo PTHH: nHCl = 2.nZn = 0,4 mol

mHCl = 0,4 . 36,5 = 14,6(g)

c) nH2 = nZn = 0,2 mol

VH2 = 0,2 . 22,4 = 4,48 (l)