This document provides the molecular dissociation energies in electronvolts (eV) for NaCl, Li2, and N2 given their bond strengths in kilojoules per mole. It first converts the bond strengths in kJ/mol to J/molecule. It then calculates the molecular dissociation energy in eV by dividing the energy in J/molecule by the charge of an electron. The dissociation energies calculated are 4.25 eV for NaCl, 1.0996 eV for Li2, and 9.80 eV for N2.

1. 1
Bond strengths are
frequently given in units
of kilojoules per mole.
Find the molecular
dissociation energy (in
eV) from the following
bond strengths: (a)
NaCl, 410 kJ/mole; (b)
Li2, 106 kJ/mole; (c) N2,
945 kJ/mole.
Helping Tools
No.1
OR
OR
OR
No.2

2. 2
No.3
OR
OR
Solution

3. 3
19
23
4
( )
410 410000
410000
1.602 10
1
6.02 10
410000
9.64 10
410000
96400
4.25
a
kJ J
E
mole mole
eV
X
X
X
X molecules
eV
X molecule
eV
molecule
eV
molecule
−
= =
=
=
=
=
19
23
4
(b)
106 106000
106000
1.602 10
1
6.02 10
106000
9.64 10
106000
96400
1.0996
kJ J
E
mole mole
eV
X
X
X
X molecules
eV
X molecule
eV
molecule
eV
molecule
−
= =
=
=
=
=

4. 4
19
23
4
(c)
945 945000
945000
1.602 10
1
6.02 10
945000
9.64 10
945000
96400
9.80
kJ J
E
mole mole
eV
X
X
X
X molecules
eV
X molecule
eV
molecule
eV
molecule
−
= =
=
=
=
=