Oxygen is composed of three isotopes: O-16 (15.995 u), O-17 (16.999 u)

1.	Oxygen is composed of three isotopes: O-16 (15.995 u), O-17 (16.999 u), O-18 (17.999 u). One of these isotopes O-17, comprises 0.037% of oxygen. Calculate the percentage abundance of the other two isotopes, using the average atomic mass of 15.9994 u.
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Oxygen is composed of three isotopes: O-16 (15.995 u), O-17 (16.999 u), O-18 (17.999 u). One of these isotopes O-17, comprises 0.037% of oxygen. Calculate the percentage abundance of the other two isotopes, using the average atomic mass of 15.9994 u.

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