\(n_{HCl}=0,25.2=0,5\left(mol\right)\\ a,PTHH:Zn+2HCl\rightarrow ZnCl_2+H_2\\ b,n_{Zn}=n_{H_2}=n_{ZnCl_2}=\dfrac{0,5}{2}=0,25\left(mol\right)\\ m_{Zn}=0,25.65=16,25\left(g\right)\\ c,V_{H_2\left(đktc\right)}=0,25.22,4=5,6\left(l\right)\)

Không biết đúng không nữa;-;;;

a) PTHH: Zn + 2HCl -> ZnCl2 + H2 

b) HCl=250ml=0,25l

n2HCl= V/22,4= 0,5/22,4= 0,02(mol)

Zn  +  2HCl -> ZnCl2  +  H2

1          2              1         1

0,01 <-0,5--------------> 0,01

mZn= n.M= 0,01.65= 0,65(gam)

c) VH2=n . 22,4= 0,01 . 22,4= 0,224(l)
 

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

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

\(\Leftrightarrow n_{ZnCl_2}=0.2\left(mol\right)\)

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

`a)PTHH:`

`Zn + 2HCl -> ZnCl_2 + H_2 \uparrow`

`0,4`   `0,8`                          `0,4`   `(mol)`

`n_[Zn]=26/65=0,4(mol)`

`b)m_[HCl]=0,8.36,5=29,2(g)`

`c)V_[H_2]=0,4.22,4=8,96(l)`

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

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)

\(a,PTHH:Zn+2HCl\rightarrow ZnCl_2+H_2\\ Áp.dụng.ĐLBTKL,ta.có:\\ m_{Zn}+m_{HCl}=m_{ZnCl_2}+m_{H_2}\\ m_{H_2}=m_{Zn}+m_{HCl}-m_{ZnCl_2}=6,5+7,3-13,6=0,2\left(g\right)\)

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

Zn + 2HCl -----> ZnCl₂ + H₂

0,2     0,4               0,2     0,2

b, \(m_{Zn}=0,2.65=13\left(g\right)\)

\(m_{HCl}=0,4.36,5=14,6\left(g\right)\)

c, \(m_{ZnCl_2}=0,2.136=27,2\left(g\right)\)

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

PTHH: Zn + 2HCl ---> ZnCl₂ + H₂

         0,2<--0,4<--------0,2<---0,2

\(b,\left\{{}\begin{matrix}m_{Zn}=0,1.65=13\left(g\right)\\m_{HCl}=0,4.36,5=14,6\left(g\right)\end{matrix}\right.\\ c,m_{ZnCl_2}=0,2.136=27,2\left(g\right)\)

 2Al + 6HCl ----> 2AlCl₃ + 3H₂

0,1-------0,3---------0,1

n Al=0,1 mol

=>m dd HCl=54,75g

=>C% AlCl3=\(\dfrac{0,1.133,5}{2,7+54,75}100=23,23\%\)

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

Áp dung định luật BTKL : 

\(m_{H_2}=13+14.6-27.2=0.4\left(g\right)\)

\(n_{H_2}=\dfrac{0.4}{2}=0.2\left(mol\right)\)

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

\(Mg+2HCl\rightarrow MgCl_2+H_2\)

Áp dụng định luật BTKL : 

\(m_{Mg}+m_{HCl}=m_{MgCl_2}+m_{H_2}\)

\(\Rightarrow m_{Mg}=9.5+0.2-7.3=2.4\left(g\right)\)

\(n_{H_2}=\dfrac{0.2}{2}=0.1\left(mol\right)\)

\(V_{H_2}=0.1\cdot22.4=2.24\left(l\right)\)

\(a.Mg+2HCl\rightarrow MgCl_2+H_2\\ n_{H_2}=\dfrac{44,8}{22,4}=2\left(mol\right)\\ n_{HCl}=2n_{H_2}=4\left(mol\right)\\ \Rightarrow m_{HCl}=4.36,5=146\left(g\right)\\ c.n_{MgCl_2}=n_{H_2}=2\left(mol\right)\\ \Rightarrow m_{MgCl_2}=2.95=190\left(g\right)\)