The relative abundance of two isotopes of copper, having atomic masses 62.93 u and 64.94 u, are 69.09% and 30.91% respectively. Calculate the average atomic mass of copper.

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Solution

Average atomic mass = sum of product of relative abundance and atomic mass of isotopes.
Average atomic mass of copper
= (62.93 x 69.09/100) + (64.94 x 30.91/100)
= 43.478 + 20.072
= 63.55 u

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The relative abundance of two isotopes of copper, having atomic masses 62.93 u and 64.94 u, are 69.09% and 30.91% respectively. Calculate the average atomic mass of copper.

Average atomic mass = sum of product of relative abundance and atomic mass of isotopes. Average atomic mass of copper= (62.93 x 69.09/100) + (64.94 x 30.91/100)= 43.478 + 20.072= 63.55 u

Average atomic mass = sum of product of relative abundance and atomic mass of isotopes.
Average atomic mass of copper
= (62.93 x 69.09/100) + (64.94 x 30.91/100)
= 43.478 + 20.072
= 63.55 u