Science, asked by dawnmichelleheavener, 8 months ago

A compound consists of only magnesium, carbon, and oxygen. If thepercentage by mass of Mg is 63.9% and that of C is 12.2%, what is the percentage by mass of O? Group of answer choices 76.1% 23.9% 51.7% 70.9% None of the above.

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Answered by Anonymous
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