A naturally occurring sample of copper consists of 69% of 63Cu and 31%of 65Cu. The Relative mass is 62.93 and 64.93 respectively. Find the atomic mass of naturally occurring sample of copper.

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Solution

The average atomic mass of copper can be calculated by :
Average atomic mass is the sum of product of fractional abundance of isotope and atomic mass of that particular isotope.
Average atomic mass = (69 /100 ) $\times$ 62.93 + (31 /100) $\times$ 64.93
= 43.421 + 20.128
= 62.549 u

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A naturally occurring sample of copper consists of 69% of 63Cu and 31%of 65Cu. The Relative mass is 62.93 and 64.93 respectively. Find the atomic mass of naturally occurring sample of copper.

The average atomic mass of copper can be calculated by : Average atomic mass is the sum of product of fractional abundance of isotope and atomic mass of that particular isotope. Average atomic mass = (69 /100 ) × 62.93 + (31 /100) × 64.93 = 43.421 + 20.128 = 62.549 u

The average atomic mass of copper can be calculated by :
Average atomic mass is the sum of product of fractional abundance of isotope and atomic mass of that particular isotope.
Average atomic mass = (69 /100 ) $\times$ 62.93 + (31 /100) $\times$ 64.93
= 43.421 + 20.128
= 62.549 u