In Chemistry, when writing a chemical formula for a compound (e.g water, carbon dioxide etc.), why we put certain symbols of elements always at start (like H for hydrogen in 'H2O' is always written before O, never 'OH2'; and C for carbon is always written before H in 'CH4', never H4C)? Is there some rule or something else defines the formula? (please note that unrelated answers will be reported!)
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see in a chemical compound if we write like that it is not convinent for others to understand or might be confusing for us to so IUPAC made this way as the easiest way to determine compound etc hence this method has been found more suitable and across globe we use this method for decades.
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we should always know because there some as carbon C but your question is very easy as H2O means first one hydrgen then followed by 2 oxygen written as 2O . so answer is one hydrgen atom and 2 oxygen atom is short formly wrtten as H2O.
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