a) Lập công thức hóa học của muối kẽm clorua:  Z n C l 2

b) Khối lượng muối Z n C l 2  = 6,5 + 7,3 – 0,2 = 13,6 (gam)

a, Kẽm + axit clohidric → Khí hidro + muối kẽm

N_zn=0,1mol

a) có pt : Zn + 2Hcl -> ZnCl₂ + H₂

1 -> 2 -> 1 -> 1 mol

0,1-> 0,2 -> 0,1 -> o,1 mol

b) số Hcl đã dùng khi pứ là :

0,2 . 36,5= 7,3

-> số gam hcl dư là 10,95- 7,3=3,65(g)

c)m_ZnCl2=0,1 . 136=13,6g

\(a.Zn+2HCl\rightarrow ZnCl_2+H_2\\ b.n_{Zn}=\dfrac{65}{65}=1\left(mol\right)\\ n_{ZnCl_2}=n_{Zn}=1\left(mol\right)\\ \Rightarrow m_{ZnCl_2}=1.136=136\left(g\right)\\ c.n_{H_2}=n_{Zn}=1\left(mol\right)\\ \Rightarrow V_{H_2}=1.22,4=22,4\left(l\right)\)

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

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

a. \(n_{Zn}=\dfrac{6.5}{65}=0,1\left(mol\right)\)

PTHH : Zn + 2HCl -> ZnCl₂ + H₂

            0,1      0,2                  0,1

b. \(V_{H_2}=0,1.22,4=2,24\left(l\right)\)

c. \(m_{HCl}=0,2.36,5=7,3\left(g\right)\)

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

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

0,1      0,2                       0,1

\(V_{H_2}=0,1\cdot22,4=2,24l\)

\(m_{HCl}=0,2\cdot36,5=7,3g\)

Câu 1:

a, \(Zn+2HCl\rightarrow ZnCl_2+H_2\)

b, \(n_{Zn}=\dfrac{16,25}{65}=0,25\left(mol\right)\)

Theo PT: \(n_{H_2}=n_{Zn}=0,25\left(mol\right)\Rightarrow V_{H_2}=0,25.22,4=5,6\left(l\right)\)

c, \(n_{HCl}=2n_{Zn}=0,5\left(mol\right)\Rightarrow m_{Zn}=0,5.36,5=18,25\left(g\right)\)

Câu 2:

a, \(4P+5O_2\underrightarrow{t^o}2P_2O_5\)

b, \(n_P=\dfrac{1,24}{31}=0,04\left(mol\right)\)

Theo PT: \(n_{O_2}=\dfrac{5}{4}n_P=0,05\left(mol\right)\Rightarrow V_{O_2}=0,05.22,4=1,12\left(l\right)\)

c, \(n_{P_2O_5}=\dfrac{1}{2}n_P=0,02\left(mol\right)\Rightarrow m_{P_2O_5}=0,02.142=2,84\left(g\right)\)

1.

`Zn+2HCl->ZnCl_2+H_2`

0,25---0,5---------------0,25

`n_Zn=(16,25)/65=0,25 mol`

`=>V_(H_2)=0,25.22,4=5,6l`

`=>m_(HCl)=0,5.36,5=18,25g`

2.

`4P+5O_2->2P_2O_5`(to)

0,04---0,05----0,02

`nP=(1,24)\31=0,04 mol`

`V_(O_2)=0,05.22,4=1,12l`

`m_(P_2O_5)=0,02.142=2,84g`

a) Zn + 2HCl --> ZnCl₂ + H₂

b) \(n_{H_2}=\dfrac{6,1975}{24,79}=0,25\left(mol\right)\)

PTHH: Zn + 2HCl --> ZnCl₂ + H₂

           0,25<-0,5<---0,25<--0,25

=> m_Zn = 0,25.65 = 16,25 (g)

c) m_ZnCl2 = 0,25.136 = 34 (g)

C ?