The average atomic mass of lead given its three isotopes is 207.52.
<h3>What is average atomic mass?</h3>
Average atomic mass is the weighted average of the atomic masses of the naturally occurring isotopes of an element.
According to this question, the following isotopes with their percent abundance and atomic masses of lead are given:
- Pb-206 - 205.97 14.5%
- Pb-207 - 206.98 17.0%
- Pb-208 - 207.98 68.5%
- Pb-206 = 14.5/100 × 205.97
- Pb-207 = 17/100 × 206.98
- Pb-208 = 68.5/100 × 207.98
- Pb-206 = 29.865
- Pb-207 = 35.186
- Pb-208 = 142.466
The average atomic mass is as follows: 29.865 + 35.186 + 142.466 = 207.52
Therefore, the average atomic mass of lead given its three isotopes is 207.52.
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