Chemistry

Question Analysis
This question involves calculating the average atomic mass of an element with three isotopes, using their respective masses and percent abundances.
The main focus is on applying the weighted average formula correctly by converting percentages to decimals and summing the contributions of each isotope.

Key Concept Explanation
Average atomic mass = (mass of isotope 1 × decimal abundance₁) + (mass of isotope 2 × decimal abundance₂) + (mass of isotope 3 × decimal abundance₃)
Decimal abundance = percent abundance ÷ 100 (converts percentage to a proportional value for the weighted average).

Step-by-step Solution
1. Convert the percent abundances to decimals: 60% = 0.60, 30% = 0.30, 10% = 0.10.
2. Calculate the contributio...