How many hydrogen atoms does a water molecule contain? one two three

Molecule of water contains 2 atoms of hydrogen.

Explanation:

Molecule of the water have the formula of H2O which contains, two atoms of hydrogen and one atom of the oxygen. Also, we can say that the water contains the hydrogen-oxygen ratio in 2:1. A molecule is the combination of one or more atom of the same element or different elements.

This is stated according to the law of definite proportion which tells that a molecule of a compound have the elements in a fix ratio to be called the molecule of that compound.

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the product of the pressure and volume is also constant