試題詳解

22. Natural copper contains two isotopic forms. The most common isotope is ⁶³Cu (atomic mass 62.93 amu), which is 69.09% abundant. The average atomic mass of Cu is 63.55 amu. What is the mass of the other isotope?
(A) 61.90 amu
(B) 63.10 amu
(C) 64.93 amu
(D) 65.90 amu
(E) 67.10 amu