Copper exists naturally as two isotopes copper-63 with a mass of 62.93 amu and copper-65 with a mass of 64.93 amu. the average mass of copper is 63.55 amu. what is the approximate abundance of copper-63 in nature?

The percentage abundance of isotope is 69 %.

Explanation:

Average atomic mass of an element is defined as the sum of masses of each isotope each multiplied by their natural fractional abundance.

Formula used to calculate average atomic mass follows:

    .....(1)

We are given:

Let the fractional abundance of isotope be 'x'

Mass of isotope = 62.93 amu

Fractional abundance of isotope = x

Mass of isotope = 64.93 amu

Fractional abundance of isotope = (1-x)

Putting values in above equation, we get:

Converting this fractional abundance into percentage abundance by multiplying it by 100, we get:

Hence, the percentage abundance of isotope is 69 %.

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