If an element has two isotopes, one with a mass of 10.0 amu ...

Question Analysis
This question evaluates the student's ability to apply the formula for average atomic mass using given isotopic masses and fractional abundances.

Key Concept Explanation
The average atomic mass is the weighted average of the masses of all naturally occurring isotopes of an element, where the weights are the fractional abundances of each isotope.

Step-by-step Solution
1. Identify the given values: isotopic masses and fractional abundances.
2. Use the formula: .
3. Calculate the contribution of each isotope:

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