Formatting a chemical equation [closed]








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I recently came across this chemical equation :


$$\ce{2HNO3 + Na2Co3 -> 2NaNO3 + CO2 + H2O}$$


The equation describes the reaction between Nitric Acid and Sodium Carbonate, the equation states that the resulting compounds $\ce{2NaNO3}$ carbon dioxide and water would be created. However my question is how the formula should be written out. I have always written a chemical equation like this :


$$\ce{(HNO3)2 + Na2Co3 -> (NaNO3)2 + CO2 + H2O}$$


Do both ways of writing the equation state the same thing? If so which one should I use. Which form of writing the equation is considered "more correct", used more commonly or considered "more standardized". 




According to the IUPAC guidelines arabic numerals are used:



> 
> (a) As right subscripts, to indicate the number of individual constituents (atoms or groups of atoms)
> 
> 
> (c) To indicate the composition of (formal) addition compounds or non-stoichiometric compounds. The numeral is written on the line before the formula of each constituent.
> 
> 
> 


Source: IUPAC recommendations found
[here](http://www.sbcs.qmul.ac.uk/iupac/bibliog/inorg.html)


This essentially means that the first variant is correct.


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