Question

0896. Calculate the atomic mass of copper if copper-63 is 69.17% abundant and copper-65 is30.83% abundant.

Answer 1

The atomic mass of the copper is

`63*69.17\text{ \% + 65}*30.83\text{ \%}`

solve the above expression

`63*(69.17)/(100)+65*(30.83)/(100)`

`63*(6917)/(10000)+65*(3083)/(10000)`
`46.35+20.03=66.38`

So the atomic weight of the mixture is 66.36 .