calculating
the binding energy of carbon, a carbon atom has three isotopes, the carbon-12,
carbon-13 and carbon-14
to calculate the binding energy for the carbon
12, we first start by finding the
calculated or actual mass
the actual mass is given by
P(1.007825)
+ N(1.008665)= calculated mass.
carbon-12
has 6 protons and 6 neutrons
6(1.007825)
+ 6(1.008665)= 12.0984
the measured mass is 12.000000
the mass
defect is equal to 0.09844
binding
energy is given by B =∆MC2
0.09844 x (3x108)2
8.85960x109
MeV
Binding energy
per nucleon 29.8820MeV/12
7.383 x 108
MeV
This is the energy that holds the 6 protons
and 6 neutrons that make up the isotope of carbon -12 isotopes
For the 13C,
the actual mass can be given by
6(1.007825)
+ 7(1.008665)= 13.1071amu.
Mass defect is given by 13.1071-13.003355 = 0.10371amu
the binding energy is
calculated as follows
B =∆MC2
0.10371amu x (3 x108)2
9.33390 x 109 MeV
binding energy per
nucleon is given by
7.17992 x 108 MeV
to calculate the
binding energy for carbon-14, we first obtain the calculated mass for the isotopes,
carbon-14 has 8 neutron and 6 protons,
6(1.007825)
+ 8(1.008665)= 14.1163amu.
the measured mass is give by 14.003242
the mass defect is given by 14.1163 - 14.003242
0.113028amu x (3x108)2
= 1.01718 x 1010 MeV
to calculate the
binding energy of nitrogen-14, 14N,
The calculated mass
is obtained as follows
7(1.007825)
+ 7(1.008665)= 14.1154amu
The measured mass = 14.003074
Mass defect = 14.1154amu - 14.003074= 0.112356 amu
the binding energy is therefore given by
Einstein mass energy relations E=MC2
thus, 0.112356 x (3x
108 )2 m/s=1.01120 x 1010 MeV
TO calculate the
binding energy of 15N, nitrogen-15,
let us find the
actual mass, nitrogen-15 has 7 protons and 8 neutrons
7(1.007825)
+ 8(1.008665)=15.1241amu
mass defect = 15.1241 - 15.000109
=1.23986amu.
the binding energy
is given by 1.23986 (3x108 )2 m/s
=11.1587 x 1010
MeV
To compute te
binding energy per nucleon we use. We divide 11.1587 x 1010 MeV by the number of nucleons, which is 15.
to find the binding
energy per nucleon for oxygen we do the following,
note oxygen has 3
isotopes, 16O, 17O and 18O
for oxygen 16O,
there are 8 protons and 8 neutrons
the actual mass is given by P(1.007825) + N(1.008665)= calculated
mass.
8(1.007825) +
8(1.008665)=16.1273amu
mass defect = 16.1273-15.994915 = 0.132405 amu
binding energy can be calculated as follows
0.132405 x (3 x 108 )2 = 1.19165 x 1010 MeV.
1.19165 x 1010 MeV. is the energy needed to split
a nucleus into its constituent protons and neutrons.
to find the binding
energy per nucleon we divide the total binding energy by the number of the
nucleons, in the case of this oxygen isotope, the number of nucleon is 16.
thus 1.19165 x 1010 MeV/16 = 7.44778 x 108MeV.
to find the binding
energy for 17O, the actual
mass is given as
8(1.007825) + 9(1.008665)= 17.140amu
the measured mass is 16.999132
the mass defect is equal to 0.141453amu
to find the
binding energy E=MC2,
0.141453amu X (3x 108)2
= 1.27308 x 1010 MeV
The binding energy per nucleon for oxygen-17
can be given by dividing the value 1.27308 x 1010 MeV by 17( total
number of nucleons) according to
Einstein the energy 1.27308 x 1010 MeV
is the mass 0.141453amu used in binding
the nucleons into their nucleus.
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