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Your question is not worded very well, but this answer is directed at what I think you are trying to ask.

Water (chemical structure: H2O) has 2 Hydrogen atoms and 1 oxygen atom. If you add the atomic masses of each of these, you get (1.01+1.01+16.00=) 18.02 Atomic Mass units (amu).

Oxygen gas (O2) has 2 oxygen atoms combined and weighs 32.00 amu.

Nitrogen gas (N2) has 2 Nitrogen atoms and weighs (14.01+14.01=) 28.02 amu.

The reason why water seems to weigh more than these is because it is a liquid and is more dense. You can fit many more molecules of water into a space than you can of oxygen or nitrogen at normal room temperature and pressure. Because of this, the same volume of water will weigh more than a volume of air (Oxygen or Nitrogen)- it has many more molecules in the same volume.

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Q: Why are water molecules lighter than oxygen and nitrogen?
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