Isotopes+and+their+mixtures

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Natural Mixtures Of Isotopes The atomic (molar)mass of an element shown on periodic table id the Average Of The Isotope Masses. [Average Atomic Mass:Sum of Mass #of each isotope × its percentage abundance] NOTE:the average atomic mass （ molar mass ) is usually rounded to 1 decimal

Eg1.)Gallium has two isotopes :69Ga=60.0%, 71Ga=40.0%.What is the molar mass of Ga? (69x60.0%)+(71x40.0%)=69.8g/mol