Q. 104.8( 23 Votes )

If bromine is available in the form of, say, two isotopes 7935Br (49.7%) 8135Br (5,3%) calculate the average atomic mass of bromine atom.

Answer :

We know that upper digit in the symbol of an isotope represents its mass (which is the same as its mass number). Now:

(i) The mass of isotope is 79 u and its abundance is 49.7%.


(ii) The mass of isotope is 81 u and its abundance is 50.3%.


So, Average atomic mass of bromine = 79 ×


=


= 39.263 + 40.743


= 80.006


= 80u


Thus, the average atomic mass of bromine is 80 u.

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