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

1.32    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%

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For different isotopes of argon, we have given their naturally occurring abundances.

So, to calculate the molar mass:

Multiply the isotopic molar mass with their abundance to get the molar mass, and then add all of them to get,

$\therefore Molar\ Mass\ of Argon = \sum m_{i}A_{i}$

$= (35.96755\times0.337)+ (37.96272\times0.063)+(39.9624\times99.600)$

$= 39.948g\ mol^{-1}$

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