Balanced equation for synthesis of p-nitrophenol from p-nitrodiaznoium chloride salt and sulfuric acid/water?
The sulfuric acid is not consumed in the reaction pathway to product, so there's no reason for it to appear in the equation for the reaction.  Therefor, the overall equation for the reaction is $$\ce{([C6H4N3O2]+ Cl^{-}) + H2O -&gt; C6H5NO3 + N2 + HCl}$$