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Question:

What is the atomic mass of copper atom?

the element copper has 2 naturally occurring isotopes: 62.2% of all copper samples consist of atoms with 34 neutrons, and 30.8% of all samples consist of atoms with 36 neutrons. calculate the average atomic mass of copper atom. PLEASE help me im really stuck on this problem.

Answer:

All copper atoms have 29 protons. 62.2% + 30.8% = 93.0% So there is another 7% of copper atoms that are unaccounted for, so this is going to be a VERY approximate calculation: (0.622 / 0.93) x (29 + 34) + (0.308 / 0.930) x (29 + 36) = 63.7 g/mol
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