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The question needs rephrasing. If someone asked you how many fruits to a kilogram. You will not able to give a correct answer. If it is apples you may have 4 apples to a kilogram or 10 bananas to a kilogram. Similarly all molecules are not of the same size, some are bigger, some are smaller.

If you take 12 gms of carbon or 1 gm of Hydrogen or 16 gms of Oxygen they contatin N ( avogadro no of atoms).

One Avogadro No is 6.022x 10 power 23 items.

So (12 divided/ Avogadro Number) gms is equal to 1 atom of carbon

(1/Avogadro Number) gms is equal to 1 atom of Hydrogen

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12y ago

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