The rest mass of a proton is 1.0072764666 u and that of a neutron is 1.0086649158 u. The ⁷⁵As nucleus weighs 74.92160 u. Calculate the mass defect of the nucleus in amu.

Question

Quizplus · Accepted Answer

The mass defect is calculated by subtracting the actual mass of the nucleus from the sum of the masses of its constituent protons and neutrons. For ⁷⁵As, with 33 protons and 42 neutrons, the mass defect is (33 * 1.0072764666 u + 42 * 1.0086649158 u) - 74.92160 u = 0.682450 u.

The Rest Mass of a Proton Is 1