YouTube Lecture # 5

1. 1
Calculate the binding
energy per atom for
metallic Na and Cu.
Helping Tools
No.1

2. 2
No.2

3. 3
OR
No.3

4. 4
Solution

5. 5
We know that the relationship
between the molar cohesive
energy E and the ionic
binding energy B is given by:
1
( )(2 )
2
coh
coh A A
E B N BN
 
Na (Sodium)

6. 6
23
23
19
23
19
23
4
Now,
107 /
6.02 10 /
107000
6.02 10
1
107000 ( 10 )
1.602
6.02 10
66791.51 10
6.02 10
11094.93 10
1.109493
coh
coh A
A
E
E BN B
N
kJ mol
X mol
J
X
X X eV
X
X eV
X
X eV
eV

  







7. 7
Cu (Copper)

8. 8
23
23
19
23
19
23
4
Similarly,
337 /
6.02 10 /
337000
6.02 10
1
337000 ( 10 )
1.602
6.02 10
210362.047 10
6.02 10
34943.86 10
3.494386
coh
coh A
A
E
E BN B
N
kJ mol
X mol
J
X
X X eV
X
X eV
X
X eV
eV

  





