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water is made of two elements oxygen and hydrogen. H2O..being that there are two parts of hydrogen and one part oxygen. then most of the mass of water would be hydrogen.

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Which elements make up the most common compound in the human body?

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Hydrogen and oxygen Water is the most common molecule, between 55 and 65% of our mass. Hydrogen accounts for 63% of our atoms, but oxygen accounts for 65% of our mass. (Both hydrogen and oxygen are part of many other molecules besides water.)


Which two elements makes up the most common compound in the human body?

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