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What happens when solid dinitrogen pentoxide is added to water?
It reacts with the water to form nitric acid
##"N"_2"O"_5## is the acid anhydride of nitric acid.
##"N"_2"O"_5 + "H"_2"O" → "2HNO"_3##
The net ionic equation is
##"N"_2"O"_5"(s)" + "3H"_2"O""(l)" → "2H"_3"O"^+"(aq)" + "2NO"_3^"-""(aq)"##