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Oxygen is composed of three isotopes: oxygen-16, oxygen-17 and oxygen-18 and has an average atomic mass of 15.9988 amu. Oxygen-17 has a mass of

Oxygen is composed of three isotopes: oxygen-16, oxygen-17 and oxygen-18 and has an average atomic mass of 15.9988 amu. Oxygen-17 has a mass of 16.990 amu and makes up 0.031% of oxygen. Oxygen-16 has a mass of 15.970 amu and oxygen-18 has a mass of 17.998 amu. What is the percentage abundance of oxygen-18?

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