Use the data given in the following table to calculate the molar mass of naturally occuring argon isotopes



Q.32:- Use the data given in the following table to calculate the molar mass of naturally occuring argon isotopes:

Isotope              Isotopic molar mass            Abundance

36Ar                  35.96755 g mol-1                 0.337%

38Ar                  37.96272 g mol-1                0.063%

40Ar                  39.9624 g mol-1                  99.600%

Answer:-



Molar mass of Ar =  ∑piAi
= (0.00337×35.96755)+(0.00063×37.96272)+(0.99600×39.9624) = 39.948 g mol-1