An element has three isotopes: Isotope A with a mass of 16.0...

Question Analysis
This question assesses the student's ability to calculate the average atomic mass for an element with multiple isotopes.

Key Concept Explanation
The average atomic mass is the sum of the products of each isotope's mass and its fractional abundance.

Step-by-step Solution
1. Convert the natural abundances to fractional abundances: 70% = 0.70, 25% = 0.25, 5% = 0.05.
2. Calculate the contribution of each isotope: , , and

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