Question

Which of the following describes how the weighted average atomic mass of an element having two isotopes is determined?

A. (mass of isotope A + mass of isotope B)/ 2
B. (mass of isotope A + mass of isotope B) x (% abundance of isotope A + % abundance of isotope
C. (mass of isotope A) x (% abundance of isotope A) + (mass of isotope B) x (% abundance of isotope B)
D. 2(mass of isotope A + mass of isotope B) + (% abundance of isotope A + % abundance of isotope B) / 2

Answer 1

@GAzela1997

Answer 2

@Luigi0210 @smash00

Answer 3

The average atomic mass you see on the Periodic Table is the sum of the relative abundance masses of each isotope.
So, if an element had two isotopes, A and B.

Avg. atomic mass = (relative abundance A)(mass of A) + (relative abundance of B)(mass of B)

Answer 4

okay yep! Thank you