How to calculate the molar mass?

How do I calculate the % abundances of two copper isotopes given the mass of each isotope and the molar mass?

  • Copper metal is a mixture of two isotopes: Cu-63 mass = 62.9298 u, and Cu-65 mass 64.9278 u Molar mass of Cu: 64.546 g/mole Calculate % abundances of the two isotopes. Can someone explain how to go about doing this?

  • Answer:

    Let x = % abundance of Cu-63 and let y = % abundance of Cu-65 x + y = 100 64.546 = 62.9298 x + 64.9278 ( 100-x) / 100 64.546 = 62.9298 x + 6492.78 - 64.0278 x / 100 6454.6 = - 1.098 x + 6492.78 38.18 = 1.098 x x = 34.8 % => Cu-63

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