Question

Element x occurs in nature in the form of two isotopes of atomic masses 23u and 24u respectively.If its average atomic mass is 23.2u,then %abundance of lighter isotope is

Answer 1

Answer:

80%

Explanation:

Let abundance of lighter isotope x.

Thn abundance of heavier will be (100-x)

[as only two isotopes are there]

Using

Average atomic mass ={ (isotope 1 * its %abundance) + (isotope 2* its percentage abundance)} /100

23.2= 23*x +(100-x)*24/100

On solving

We get

80%