Question

Question #a535f

Answer 1

Atomic mass of an element is defined as the weighted average mass of atoms of an element, calculated using the relative abundance of nuclides in a naturally-occurring mass of that element.

In nature the in a mass of CHlORINE two types of nuclides are present`-""_17^35Cl and ""_17^37Cl`

If percent abundance of `""_17^35Cl` be `x%` then percent abundance of `""_17^37Cl` will be `(100-x)%`

The atomic mass of `Cl->35.453" g/mol"`

So weighted average atomic mass

`(xxx35+(100-x)37)/100=35.453`

`=>35x-37x=3545.3-3700=-154.7`

`x=154.7/2=77.35`

So Abundance

`""_17^35Cl->77.35%`

and

`""_17^37Cl->22.65%`