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A sample of oxygen contains two isotopes...

A sample of oxygen contains two isotopes of oxygen with massess 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 ?

A

17.5 u

B

17 u

C

16 u

D

16.5 u

Text Solution

Verified by Experts

The correct Answer is:
D
Isotope 1 `to ` 16 u
Isotope `2 to 18u`
Proportion of Isotopes =3:1
Now Average atomic Oxygen `=(16xx3) +(18xx1)//3+1=16.5u`
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