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10.3k views
in Chemistry by (30.0k points)

If bromine atom is available in the form of, say, two isotopes  35Br79 (49.7%) and 35Br81 (50.3%), calculate the average atomic mass of bromine atom.

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1 Answer

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by (130k points)

The average atomic mass of bromine 

= (79 x 49.7)+ (81 x 50.3)/100 

= (3926.3 + 4074.3)/100 

= 8000.6/100 

= 80 u

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