a,\(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\)
PTHH: Zn + 2HCl → ZnCl2 + H2
Mol: 0,1 0,2 0,1 0,1
b,\(V_{H_2}=0,1.24,79=2,479\left(l\right)\)
c,\(m_{ddHCl}=\dfrac{0,2.36,5.100}{3,65}=200\left(g\right)\)
d,\(m_{ZnCl_2}=0,1.136=13,6\left(g\right)\)
e,mdd sau pứ = 6,5+200-0,1.2 = 206,3 (g)
\(C\%_{ddZnCl_2}=\dfrac{13,6.100\%}{206,3}=6,59\%\)
Bài 3 :
\(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\)
a) Pt : \(Zn+2HCl\rightarrow ZnCl_2+H_2|\)
1 2 1 1
0,1 0,2 0,1 0,1
b) \(n_{H2}=\dfrac{0,1.1}{1}=0,1\left(mol\right)\)
\(V_{H2\left(dktc\right)}=0,1.22,4=2,24\left(l\right)\)
c) \(n_{HCl}=\dfrac{0,1.2}{1}=0,2\left(mol\right)\)
\(m_{HCl}=0,2.36,5=7,3\left(g\right)\)
\(m_{ddHCl}=\dfrac{7,3.100}{3,65}=200\left(g\right)\)
d) \(n_{ZnCl2}=\dfrac{0,1.1}{1}=0,1\left(mol\right)\)
⇒ \(m_{ZnCl2}=0,1.136=13,6\left(g\right)\)
e) \(m_{ddspu}=6,5+200-\left(0,1.2\right)=206,3\left(g\right)\)
\(C_{ZnCl2}=\dfrac{13,6.100}{206,3}=6,6\)0/0
Chúc bạn học tốt
ta có nZN=mZN/MZN=6,5/65=0,1
nH2=nZN=0,1 mol=>VH2=2,4 l
a. PTHH: Zn + 2HCl ---> ZnCl2 + H2
b. Ta có: nZn = \(\dfrac{6,5}{65}=0,1\left(mol\right)\)
Theo PT: \(n_{H_2}=n_{Zn}=0,1\left(mol\right)\)
=> \(V_{H_2}=0,1.22,4=2,24\left(lít\right)\)
c. Ta có: nHCl = 2 . nZn = 2 . 0,1 = 0,2(mol)
=> mHCl = 0,2 . 36,5 = 7,3(g)
Ta có: \(\dfrac{7,3}{m_{dd}}.100\%=3,65\%\)
=> \(m_{dd}=200\left(g\right)\)
d. Theo PT: \(n_{ZnCl_2}=n_{Zn}=0,1\left(mol\right)\)
=> \(m_{ZnCl_2}=0,1.136=13,6\left(g\right)\)
