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What is meant by (a) 2H and H2 (b) H20 and 3H2O ?

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What is meant by 

(a) 2H and H2 

(b) H20 and 3H2O ?

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1 Answer

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(a) 2H is two atoms of hydrogen. H2 is one molecule of hydrogen gas. 

(b) H20 represents one molecule of water. 3H20 represents 3 molecules of water.

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