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Use the data given in the following table to calculate the molar mass of naturally occurring argon.

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It's a simple solution. Just take molar mass of isotopes, mulitply by the percentage and you get your answer. {35.96755 × (0.337/100)} + {37.96272 × (0.063/100)} + {39.9624 × (99.600/100)} = 0.1212106435 + 0.0239165136 +39.8025504 = 39.947677557
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