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June 29, 2015

Homework Help: chemistry

Posted by Lisa on Sunday, October 18, 2009 at 2:25pm.

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. (Give your answer to 3 decimal places.)

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