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