Naturally occurring copper consists of isotopes of Cu 63 and Cu 65 in the ratio 8:3 What will be the mean atomic weight of copper?

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answer is 63.54.

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Detailed Solution

Total number of atoms =8+3=11. There are 8 atoms of Cu 63 and 3 atoms of Cu 65 ∴ Mean at. wt. of Cu=8×63+3×658+3=11=504+19511=69911=63.54

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