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Oxygen occurs in nature as a mixture of isotopes O 16,O 17 and O 18 having atomic masses of 15.995 u, 16.999 u and 17.999 u and relative abundance of 99:763%,0.037% and 0.200% respectively. What is the average atomic mass of oxygen?

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a

15.999 u

b

16.999 u

c

17.999 u

d

18.999 u

answer is A.

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Detailed Solution

Atomic mass of oxygen = =(99.763×15.995)+(0.037×16.999)+(0.200×17.999)100 = 15.999 u

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Oxygen occurs in nature as a mixture of isotopes O 16,O 17 and O 18 having atomic masses of 15.995 u, 16.999 u and 17.999 u and relative abundance of 99:763%,0.037% and 0.200% respectively. What is the average atomic mass of oxygen?