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

Oxygen is composed of three isotopes: oxygen-16, oxygen-17, oxygen-18 and has an average atomic mass of 15.9992 amu. Oxygen-17 has a mass of 16.980 amu and makes up 0.033% of oxygen. Oxygen-16 has a mass of 15.988 amu and oxygen-18 has a mass of 17.984 amu. What is the percent abundance of oxygen-18?

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