<span>Calculating the average atomic mass involves a method similar to that of a weighted average. Follow this equation:
(mass1)(percentage1) + (mass2)(percentage2) = average atomic mass
(35.0)(0.75) + (37.0)(0.25) = average atomic mass
Ensure the percentages are represented in decimal format for accurate results.
While another response may be accurate, it lacks some clarity. Two potential answers can be dismissed immediately: 35.0 amu and 37.0 amu cannot represent the average. If the isotopes were mixed equally at 50%, then 36.0 amu would be the correct response; however, we have a 75/25 mix. Thus, only one answer remains viable.</span>
