Question

The atomic masses of the two stable isotopes of copper 63Cu29 (69.17 percent) and 65Cu29 (30.83 percent)â are 62.929599 and 64.927793 amu, respectively. Calculate the average atomic mass of copper.

Answer 1

Answer:

Average atomic mass of copper is 63.545642 amu

Explanation:

100 atoms of copper contains 69.17 number of $Cu_{29}^{63}$ atoms and 30.83 number of $Cu_{29}^{65}$ atoms.

Therefore average atomic mass of copper is given by-

$\frac{(69.17\times atomic mass of Cu_{29}^{63})+(30.83\times atomic mass of Cu_{29}^{65})}{100}$

=$\frac{(69.17\times 62.929599 amu)+(30.83\times 64.927793 amu)}{100}$

=63.545642 amu