5. Calculate the atomic mass of Oxygen if the three common isotopes of Oxygen have masses of 15.995 amu (99.759% abundance), 16.995 amu (0.037 % abundance), and 17.999 amu (0.204 % abundance).

16 amu

Explanation:

Given that,

The three common isotopes of oxygen are as follows :

15.995 amu (99.759% abundance), 16.995 amu (0.037 % abundance), and 17.999 amu (0.204 % abundance).

The atomic mass of Oxygen is given as follows :

or

Z = 16 amu

Hence, the atomic mass of Oxygen is 16 amu.

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