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

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)

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

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

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)
 

a) Zn + 2HCl --> ZnCl₂ + H₂

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

PTHH: Zn + 2HCl --> ZnCl₂ + H₂

           0,2-->0,4------------>0,2

=> V_H2 = 0,2.22,4 = 4,48 (l)

c) m_HCl = 0,4.36,5 = 14,6 (g)

nZn = 13 : 65 = 0,2 (mol) 
pthh : Zn + 2HCl --> ZnCl2 + H2
          0,2 ------------> 0,2 ---->0,2 (mol)  
VH2 = 0,2 . 22,4 = 4,48 (l) 
mZnCl2 = 0,2 . 36,5 = 14,6 (g) 

PTHH : Zn + 2HCl -> ZnCl₂ + H₂

a) Zn + 2HCl --> ZnCl₂ + H₂

b) \(n_{Zn}=\dfrac{19,5}{65}=0,3\left(mol\right)\)

PTHH: Zn + 2HCl --> ZnCl₂ + H₂

            0,3------------->0,3--->0,3

=> m_ZnCl2 = 0,3.136 = 40,8 (g)

c) V_H2 = 0,3.22,4 = 6,72 (l)

a. \(PTHH:Zn+2HCl\rightarrow ZnCl_2+H_2\uparrow\)

b. \(n_{Zn}=\dfrac{19,5}{65}=0,3\left(mol\right)\)

Mol theo PTHH : \(1:2:1:1\)

Mol theo phản ứng : \(0,3\rightarrow0,6\rightarrow0,3\rightarrow0,3\)

\(\Rightarrow m_{ZnCl_2}=n_{ZnCl_2}.M_{ZnCl_2}=0,3.\left(65+71\right)=40,8\left(g\right)\)

c. Từ b. \(\Rightarrow n_{H_2}=0,3\left(mol\right)\)

\(\Rightarrow V_{H_2}=n_{H_2}.22,4=0,3.22,4=6,72\left(l\right)\)

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

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

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

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

`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)`

a. \(PTHH:Zn+2HCl--->ZnCl_2+H_2\uparrow\)

b. Biểu thức về khối lượng:

\(m_{Zn}+m_{HCl}=m_{ZnCl_2}+m_{H_2}\)

c. Dựa vào câu b, ta có:

\(130+m_{HCl}=272+4\)

\(\Leftrightarrow m_{HCl}=272+4-130=146\left(g\right)\)

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

Bảo toàn khối lượng : 

\(m_{Zm}+m_{HCl}=m_{ZnCl_2}+m_{H_2}\)

Khi đó : 

\(m_{HCl}=272+4-130=146\left(g\right)\)

a, Bảo toàn e:

\(2n_{Zn}=2n_{H_2}\)

\(\Leftrightarrow n_{Zn}=n_{H_2}=0,3\left(mol\right)\)

\(\Rightarrow m_{Zn}=19,5\left(g\right)\)

PTHH: \(Zn+2HCl\rightarrow ZnCl_2+H_2\uparrow\)