Question Detail

CHM 101 General Chemistry Objective Question

Question

How do you calculate relative atomic mass from isotopic composition?
Options
A By adding the masses of all isotopes
B By taking the average of the mass numbers weighted by their percentage abundances
Correct Answer
C By using only the most abundant isotope
D By multiplying all isotope masses together
Correct Answer

Option B is the correct answer.

Detailed Explanation

The relative atomic mass is calculated by taking into account the different masses and the abundance of the isotopes in the naturally occurring element, meaning the percentage of each isotope present.

Hint

The notes explain this as a weighted average calculation.

Question Info