Answer :


Atomic Mass of First Isotope of Chlorine = 34.9689g

Natural Abundance of First Isotope of Chlorine, Pa1 = 75.77%

= 0.7577

Total Atomic Mass of 1st Isotope, Ma1 = 34.9689×0.7577

= 26.4959g

Atomic Mass of Second Isotope of Chlorine = 36.9659g

Natural Abundance of Second Isotope of Chlorine, Pa2 = 24.23%

= 0.2423

Total Atomic Mass of 2nd Isotope, Ma2 = 36.9659×0.2423

= 8.9568g

  Avg. Atomic Mass of Chlorine =
=(26.4959 gm + 8.9568 gm)

=35.4527 gm.

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