How many n2 molecules would exist in 500g of water at 20c?

We have to know the number of molecules present in 500 g of water.

The answer is: zero molecules present in 500g of water.

Water molecule is H₂O. In water molecule, nitrogen molecule can not be present. Molecular mass of water is 18 g. MOlecular mass of nitrogen molecule is 28 g.

500 g water contains 500/18 number of moles= 27.77 moles of water molecules which contains 27.77 X 6.023 X 10²³ number of water molecules.

There is no existence of N₂ molecule.

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fe 55.85 g/mol and h2o 18.02 g/mol.