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October 23, 2014

Homework Help: chemistry

Posted by lyne on Monday, January 5, 2009 at 4:29pm.

The element rhenium (Re) has two naturally occurring isotopes, 185Re and 187Re, with an average atomic mass of 186.207 amu. Rhenium is 62.60% 187Re, and the atomic mass of 187Re is 186.956 amu. Calculate the mass of 185Re.


am i supposed to multiply the atomic masses and the percents or something?
im lost..

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