Correct Answer -
12.38
×
10
−
13
J
12.38
.
8
O
16
.
contains 8 protons, 8 electrons, and
16
−
8
=
8
16
neutrons.
Mass defect
=
Δ
m
=
[
Z
n
H
+
(
A
−
Z
)
m
n
]
−
M
=
Δ
m
=
[
8
×
1.0073
+
8
×
1.0087
]
−
15.595
Δ
=
[
8.0584
+
8.0696
]
−
15.995
=
=
16.128
−
15.995
=
0.133
a
m
u
0.133
Total binding energy
=
0.133
×
931.5
M
e
V
=
=
123.8895
M
e
V
=
Binding energy per nucleon
=
123.8895
16
=
=
7.743
M
e
V
=
=
7.743
×
10
6
e
V
=
ltbr.
=
7.743
×
10
6
×
1.6
×
10
−
19
J
=
=
12.38
×
10
−
13
J
=