CH3-CH(CH3)-COOH + P2O5 = ?

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The reaction between CH3-CH(CH3)-COOH (2-butanoic acid) and P2O5 (phosphorus pentoxide) will likely result in the dehydration of the acid, leading to the formation of the corresponding acid anhydride.

The reaction would look like this:

2 CH3-CH(CH3)-COOH + P2O5 → (CH3-CH(CH3))2O + P2O5H2

Therefore, the products of the reaction would be the anhydride of 2-butanoic acid ((CH3-CH(CH3))2O) and phosphoric acid (P2O5H2).