How many times more massive is an oxygen atom than a hydrogen atom?

An oxygen atom is 16x more massive than a hydrogen atom.

You can figure this out by comparing the atomic masses of the two elements: oxygen has an atomic mass number of 16, and hydrogen has an atomic mass number of 1. Thus, an oxygen atom is 16 times more massive than a hydrogen atom.

Oxygen is 16 times more massive.
Hydrogens atomic mass = 1.001 g/mol
Oxygen atomic mass = 15.999 g/mol

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