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Chemistry Question on Mole concept and Molar Masses

Use the data given in the following table to calculate the molar mass of naturally occuring argon isotopes:IsotopeIsotopic molar massAbundance
36Ar35.96755 g mol–10.337%
38Ar37.96272 g mol–10.063%
40Ar39.9624 g mol–199.600%
Answer

Molar mass of argon

= [(35.96755×0.337100)+(37.96272×0.063100)+(39.9624×90.60100)] gmol−1[(35.96755 × \frac {0.337}{100}) + (37.96272 × \frac {0.063}{100}) + (39.9624 × \frac {90.60}{100})] \ g mol^{-1}

= [0.121+0.024+39.802] g mol−1[0.121 + 0.024 + 39.802] \ g \ mol^{-1}

= 39.947 g mol−139.947\ g\ mol^{-1}