If an element has two isotopes, one with a mass of 10 amu an...

Question Analysis
This question tests the student's ability to calculate the average atomic mass using given isotopic masses and natural abundances.

Key Concept Explanation
The average atomic mass is calculated by multiplying each isotope's mass by its fractional abundance and then summing these products.

Step-by-step Solution
1. Convert the natural abundances to fractional abundances: 75% = 0.75, 25% = 0.25.
2. Multiply each isotope's mass by its fractional abundance: and

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