2.3 zinc has five naturally occurring isotopes: 48.63% of 64 zn with an atomic weight of 63.929 amu; 27.90% of 66zn with an atomic weight of 65.926 amu; 4.10% of 67zn with an atomic weight of 66.927 amu; 18.75% of 68zn with an atomic weight of 67.925 amu; and 0.62% of 70zn with an atomic weight of 69.925 amu. calculate the average atomic weight of zn.

The average atomic mass of element Zinc is 65.40 amu.  

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)

Mass of isotope = 63.929 amu

Percentage abundance of isotope = 48.63 %

Fractional abundance of isotope = 0.4863

Mass of isotope = 65.926 amu

Percentage abundance of isotope = 27.90 %

Fractional abundance of isotope = 0.2790

Mass of isotope = 66.927 amu

Percentage abundance of isotope = 4.10 %

Fractional abundance of isotope = 0.0410

Mass of isotope = 67.925 amu

Percentage abundance of isotope = 18.75 %

Fractional abundance of isotope = 0.1875

Mass of isotope = 69.925 amu

Percentage abundance of isotope = 0.62 %

Fractional abundance of isotope = 0.0062

Putting values in equation 1, we get:

Hence, the average atomic mass of element Zinc is 65.40 amu.