We are asked to determine the atomic weight (average molecular mass) of a Copper (Cu) given 63 Cu (atomic mass = 62.9296 amu; abundance 69.17 %) and 65 Cu (atomic mass = 64.9278 amu; abundance 30.83 %).
We will solve for atom’s average mass using their abundance.
The formula for average mass is:
Only two isotopes of copper occur naturally, 63 Cu (atomic mass = 62.9296 amu; abundance 69.17 %) and 65 Cu (atomic mass = 64.9278 amu; abundance 30.83 %).
Calculate the atomic weight (average atomic mass) of copper.
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