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November 23, 2014

Homework Help: Calculating Average Atomic Mass

Posted by Lena on Saturday, September 8, 2007 at 11:57pm.

Rubidium has 2 common isotopes, Rb 85 and Rb 87. If the abudance of Rb 85 is 70 percent and the abundance of Rb 87 is 30 percent, what is the average atmoic mass of rubidium?

For the above question, does this mean I would multiple 85 by .70, 87 by .30, and average those two answers? Thank you!

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