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Oxygen is heavier as it has a mass number of 16 whereas hydrogen has a mass number of 1. Both form diatomic molecules (molecules of two atoms) making the formula masses 32 for oxygen and 2 for hydrogen.

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Q: What is heavier Hydrogen gas or oxygen gas How do you know?
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What gas is heavier hydrogen or oxygen?

oxygen gas is heavier than hydrogen gas


Which is more heavier - hydrogen gas or oxygen gas?

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