To solve this, we must know the formula for mass defect. Protons and neutrons are the nucleons at play here. Therefore, the mass defect of the nucleus of thorium-232 is 1.911384 amu.
The difference or disparity between the mass of the nucleus and the mass of the nucleons is known as a mass defect.
mass of protons = 1.6727 x 10⁻²⁴ g
= 1.007316 amu
mass of neutrons= 1.6750 x 10⁻²⁴ g
= 1.008701 amu
mass of Thorium= 234 g/mol
= 234 amu
In thorium -232
protons = 90
neutrons = 144
mass defect = mass of protons×90 + mass of neutrons ×144 - 234
mass defect = 1.911384 amu
Therefore, the mass defect of the nucleus of thorium-232 is 1.911384 amu.
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