Question Detail
Question
Find the mass defect of ⁶³₂₉Cu if the actual mass of copper is 62.91367u.
Correct Answer
Option C is the correct answer.
Detailed Explanation
For Copper-63 (Z=29, A=63, N=34). Mass defect Δm = [29(1.007276 + 0.00054858) + 34(1.008665)] - 62.91367 = [29(1.00782458) + 34.29461] - 62.91367 = [29.22691282 + 34.29461] - 62.91367 = 63.52152282 - 62.91367 = 0.60785282 u. The closest option is 0.59223u.
Hint
Mass defect = [Z(m_p + m_e) + (A-Z)m_n] - M_actual.