These spectra are from the set of seven compounds from the pre-lab for this experiment: acetanilide, acetic anhydride, acetone, benzoic acid, caffeine, ethyl-4-aminobenzoate, and ethyl acetate. for each spectrum list the wavenumber of any carbonyl (c=o) stretch present and identify the molecule. give a brief (one sentence) explanation for your choice. one compound will not be used.

Sulfur dioxide and oxygen react to form sulfur trioxide during one of the key steps in sulfuric acid synthesis. an industrial chemist studying this reaction fills a 25.0l tank with 4.5 mol of sulfur dioxide gas and 4.5 mol of oxygen gas at 30.°c. he then raises the temperature, and when the mixture has come to equilibrium measures the amount of sulfur trioxide gas to be 1.4 mol. calculate the concentration equilibrium constant for the reaction of sulfur dioxide and oxygen at the final temperature of the mixture. round your answer to 2 significant digits.