Question

pls answer q 20 a pls pls pls​

Answer 1

Answer:

20% & 80%

Explanation:

formula for average atomic mass= mass of x1* % of x1+massof x2*%of x2/100

       let % of x1 be 'a' then % of x2 will be'100-a'

therefore,

         10*a + 11(100-a)/100 = 10.8

         10a + 1100 - 11a = 10.8 *100

         1100-a=1080

          a=1100-1080

          a=20

therefore the percentage of the isotopes are 20% & (100-20) = 80%