Question

The table below shows isotopes and their percentage abundances.

Isotope	A	B	C
Isotope mass	54	56	57
Percentage abundances	6.0	92.0	2.0

Calculate the relative atomic mass of the element with the above isotopes. 

Answer 1

R.A.M =  54 x 6+ 56 x 92 + 57 x 2
                        100                                  
= 324 + 5152 + 114
             100                
= ⁵⁵⁹⁰/₁₀₀
= 55.9