Calculate the average atomic mass of an imaginary element Chemistrium symbol Ch given that there are three naturally occurring isotopes of the following Mass and abundancies:

Question

Ch – 501, 25% , Ch – 504, 40% , Ch – 505 , 35% 

Answer 1

The average atomic mass of an element with isotopes is simply the weighted average based on abundance. Thus, we can find the average mass as follows:

average mass = (0.25 x 501) + (0.40 x 504) + (0.35 x 505) = 125.25 + 201.6 + 176.75

average mass = 503.6 amu