AP Chemistry Question of the Day

Test your knowledge with a hand-picked multiple-choice question.

An element has two main isotopes. The first isotope has a molar mass of 125 grams, and the second isotope has a molar mass of 128 grams. A naturally occurring sample of the element has a molar mass of 126.8 grams.

What is the lighter isotope's percentage in the natural sample?

Select an answer and click Check.
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