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Yes, esterification using an anhydride is feasible with P2O5 as a dehydrating agent. P2O5 is a strong dehydrating agent that can remove water from the reaction mixture, driving the equilibrium towards the ester product. The anhydride reacts with the alcohol, forming the ester and a carboxylic acid. P2O5 then removes the water produced, preventing the reverse reaction and promoting the formation of the ester.