Answer:
option A.
Explanation:
given,
The abundance and atomic mass of In-113 is 4.29 % and 112.904
The abundance and atomic mass of In-115 is 95.71 % and 114.904
Average atomic mass = [tex]\sum\dfrac{isotope\ mass \times abundance\ of\ isotope}{100}[/tex]
Average atomic mass =[tex]\dfrac{4.29\times 112.904+95.71\times 114.904}{100}[/tex]
=[tex]\dfrac{4.29\times 112.904+95.71\times 114.904}{100}[/tex]
= 114.818
the average atomic mass comes out to be 114.818
hence, the correct answer is option A.
