Question Detail
Question
If Carbon-12 has a relative abundance of 98.89%, Carbon-13 has a relative abundance of 1.11%, what is the average atomic mass of C?
Correct Answer
Option A is the correct answer.
Detailed Explanation
Average = (0.9889 × 12) + (0.0111 × 13) = 11.8668 + 0.1443 = 12.0111 ≈ 12.01.
Hint
Multiply each isotope's mass by its fractional abundance and sum.