Use data given in the following table to calculate the molar mass of naturaly occuring argon isotopes:
`{:("Isotope",,"Isotopic molar mass",,"Abundance"),(.^(36)Ar,,35.96755 g mol^(-1),,0.337%),(.^(38)Ar,,37.96272 g mol^(-1),,0.063%),(.^(40)Ar,,39.9624 g mol^(-1),,99.600%):}`

Answer

`39.948 g mol ^(-1)`

Explanation

Molar mass of argon
`=[(35.96755xx(0.337)/(100))+(37.96282xx(0.063)/(100))+(39.9624xx(90.60)/(100))]gmol^(-1)`
`=[0.121+0.021+39.802] g mol^(-1)`
`=39.947 g mol^(-1)`