Question

why was formula of water is H2O but not OH2?​

Answer 1

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It's because of the Hill System of writing chemical formulas. Carbons first, then Hydrogens, then everything else in alphabetical order. ... H20 follows the Hill system, where carbon and hydrogen atoms come first.

Answer 2

Answer:

It depends. You can write H2O for simplicity, but sometimes it is better to write OH2 to indicate that the oxygen is the one binding to the metal rather than hydrogen.

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