Question

if an element m has 2 isotopes m40,m42 the average atom is 41.2 calculate percentage of abundance of both the isotopes​

Answer 1

Answer:

80, 20

Explanation:

%age abundance of m40 be x

then %age abundance of m42 be (100-x)

the avg at mass= (x×40)+(100-x)42

-----------------------

100

so, 40x + (100-x)42 = 41.2

--------------------

100

40x + 4200 - 42x = 41.2 × 100

-x = 4120 - 4200

x = 80

so,

100-x = 100 -80 = 20