Question

Copper consist of two isotopes Cu 63 and Cu 65 whose relative abundance is 69% and 31% respectively .calculate the average atomic mass of copper.​

Answer 1

Answer:

Copper has two isotopes, 63Cu (69.15%, mass=62.9300 amu) and 65Cu (30.85%, mass = 64.928 amu), and so the respective mole fractions are 0.6915 and 0.3085, resulting in an average atomic weight of 63.55 amu, even though there is not a single atom that weighs 63.55 amu.

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