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Average isotopic mass is:

1. 200 × 90 + 199 × 8 + 202 × 2
2. 18000 + 1592 + 404
3. 19996 = 199.96 amu
4. Average isotopic mass = (Mass of isotope A × % natural abundance) + (Mass of isotope B × % natural abundance)

Correct answer: Average isotopic mass = (Mass of isotope A × % natural abundance) + (Mass of isotope B × % natural abundance)

Solution

The correct formula for calculating the average isotopic mass is given in option D, which involves multiplying the mass of each isotope by its natural abundance and summing the results.

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