A sample of oxygen consists of three iso...

A sample of oxygen consists of three isotopes O - 16, O - 17 and O - 18 in the relative abundance of 99.76 %, 0.04 % and 0.20 % respectively. What is the average atomic mass of oxygen ?

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Verified by Experts

The correct Answer is:

16.004 u

According to available data :
Average atomic mass of oxygen `= 16 xx 0.9976 + 17 xx0.0004 + 18 xx 0.002`
`= 15.9616 + 0.0068 + 0.036 = 16.004 u`.

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