A sample of oxygen contains two isotopes of oxygen with masses 16 u and 18 u respectively The propor...........

General Science (NDA) Chemistry

A sample of oxygen contains two isotopes of oxygen with masses 16 u and 18 u respectively. The proportion of these isotopes in the sample is 3 : 1. What will be the average atomic mass of oxygen in this sample?

17.5 u

17 u

16 u

16.5 u

Explanation:

Option 4
Isotope 1 $\rightarrow$ 16 u
Isotope 2 $\rightarrow$ 18u
Proportion of Isotopes = 3: I
Now, Average atomic Oxygen = (16 x 3) + (18x 1)/3+I = 16.5 u