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Yes, esterification using an anhydride is feasible with P2O5 as a dehydrating agent for fatty acids. P2O5 (phosphorus pentoxide) is a powerful dehydrating agent, and its reaction with fatty acids can lead to the formation of anhydrides. These anhydrides can then react with alcohols to form esters. This process is commonly used in organic synthesis, especially for the preparation of esters from carboxylic acids.