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July 24, 2014

Homework Help: Calculating Averages?

Posted by Alison on Monday, August 29, 2011 at 9:15pm.

A certain element has four isotopes.
5.85% of has a mass of 53.93961 .
91.8% of has a mass of 55.934939 .
2.12% of has a mass of 56.93539 .
0.282% of has a mass of 57.93328 .
What is the average atomic mass of element ?
Express your answer numerically to three significant figures.

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