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The molar mass of boron atoms in a natural sample is 10.81 g/mol. The sample is known to consist of 10 B (molar mass 10.013

The molar mass of boron atoms in a natural sample is 10.81 g/mol. The sample is known to consist of 10 B (molar mass 10.013 g/mol) and 11 B (molar mass 11.093 g/mol). What are the abundances of the two isotopes?

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