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one mole of any element is equals to its gam(Gram Atomic Mass)

and one mole of any molecule is also equals to that molecules gram Atomic Mass.

Lets calculate the gram molecular mass of water :

h2o = 2 hydrogen atoms, 1 oxygen atom

= 2 hydrogen x 1g (gram atomic mass of hydrogen) + 1 oxygen x 16g (gram atomic mass of oxygen)

= 2 + 16

= 18g

Therefore 1 mole of water contains 18grams.

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