Answer:
The percentage relative abundance of Cu-63 is 69.5% and that of Cu-65 is 30.5%
Explanation:
The mass of Cu-63 is 62.9396 amu
The mass of Cu-65 is 64.9278 amu
Relative abundance of each isotope ?
The average atomic mass of Copper is; 63.546 u
The relationship between abundance, mass of isotopes and average atomic mass is;
(M1)(x) + (M2)(1-x) = M(E)
Where;
M1 = Mass of first isotope
x = Abundance of first isotope
M2 = Mass of second isotope
M(E) = Average atomic mass
Inserting the vaues, we have;
62.9396 (x) + 64.9278 (1-x) = 63.546
62.9396x - 64.9278x + 64.9278 = 63.546
- 1.9882x = 63.546 - 64.9278
- 1.9882x = - 1,3818
x = 0.695 or 69.5%
The percentage relative abundance of Cu-63 is 69.5% and that of Cu-65 is 30.5%
