Answer :

Atomic Mass of First Isotope of Argon = 35.96755g

Natural Abundance of First Isotope of Argon, Pa1= 0.337% = 0.00337


Total Atomic Mass of 1st Isotope, Ma1 = 35.96755×0.00337


= 0.12121g


Atomic Mass of Second Isotope of Argon = 37.96272g


Natural Abundance of Second Isotope of Argon, Pa2 = 0.063%


=0.00063


Total Atomic Mass of 2nd Isotope, Ma2 = 37.96272×0.00063


= 0.02392g


Atomic Mass of Third Isotope of Argon = 39.9624g


Natural Abundance of Third Isotope of Argon, Pa3 = 99.6%


Total Atomic Mass of 3rd Isotope, Ma3 = 39.9624×0.996


= 39.8026g


So Average Atomic Mass of Argon =



39.9477g


Therefore, the average atomic mass of Argon is 39.95g


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