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Use the data given in the following table to calculate the molar mass of naturally occurring argon.IsotopeIsotopic molar massAbundance36Ar35.96755 g mol-10.337%38Ar37.96272 g mol-10.063%40Ar39.9624 g mol-199.600% |
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Answer» The molar mass of the naturally occurring argon is equal to the weighted arithmetic mean of the various isotopes present in it. Then molar mass of argon = {0.337 x 35.96755 g/mol + 0.063 x 37.96272 g/mol + 99.6 x 39.9624 g/mol}/{100} = {12.121 g/mol + 2.392 g/mol + 3980.255 g/mol}/{100} = {3994.768 g/ml}/{100} = 39.948 g/ml |
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