Question

A certain (fictional) element has exactly three stable isotopes which occur in different
proportions in nature. Two of the masses are given in the table below.
Isotope Mass (u) Abundance (%)
A 93.9896 52.0
B 95.9981 16.0
C ? ?
The atomic weight of the element has been calculated as 93.644. Please find the mass and
abundance of isotope C

Answer 1

93.9896(52/100)+95.9981(16/100)+c(32/100)=93.644
I believe you can understand it. :)

Answer 2

@lelia_tan Thank you, if I may ask, why did you divide them by 100?

Answer 3

to convert the percentages to numbers.

10% = \(\dfrac{10\%}{100\%}=0.1\)