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Answer :
The mass defect of one nucleus of europium-156 is 0.100688 amu. The mass defect of one nucleus of europium-156 is 1.67 x 10-27 kg.
(a) A europium-156 nucleus has a mass of 155.924752 amu. To calculate the mass defect (Am) in amu and kg for the breaking of one nucleus (1 mol = 6.022 x 1023 nuclei) of europium-156 into its component nucleons if the mass of a proton = 1.00728 amu and the mass of a neutron = 1.00867 amu, we can use the formula:
Am = (Zmp + Nmn) - M
where Am is the mass defect, Z is the atomic number, mp is the mass of a proton, N is the number of neutrons, mn is the mass of a neutron, and M is the mass of the nucleus.
Given that europium-156 has 63 protons and 93 neutrons, we can substitute the values into the formula to get:
Am = (63 x 1.00728 + 93 x 1.00867) - 155.924752
Am = 0.100688 amu
To convert this into kilograms, we use the conversion factor 1 amu = 1.66 x 10-27 kg:
Am = 0.100688 amu x 1.66 x 10-27 kg/amu
Am = 1.67 x 10-27 kg
(b) To calculate the binding energy (in J) of the nucleus given the speed of light = 3.0 x 108 m/s, we can use Einstein's equation:
E = mc2
where E is the binding energy, m is the mass defect, and c is the speed of light
Given that the mass defect is 0.100688 amu, we can convert this into kilograms using the conversion factor 1 amu = 1.66 x 10-27 kg:
m = 0.100688 amu x 1.66 x 10-27 kg/amu
m = 1.67 x 10-28 kg
Substituting the values into the equation, we get:
E = 1.67 x 10-28 kg x (3.0 x 108 m/s)2
E = 1.505 x 10-11 J
Therefore, the mass defect of one nucleus of europium-156 is 0.100688 amu and the mass defect of one nucleus of europium-156 is 1.67 x 10-27 kg. The binding energy of the nucleus is 1.505 x 10-11 J.
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