18-31. In formaldehyde, the transition n S p*(T1) occurs at 397 nm, and the n S p*(S1) transition comes at 355 nm. What is the differ- ence in energy (kJ/mol) between the S1 and T1 states? This differ- ence is due to the different electron spins in the two states.

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Element before carbon on the periodic table

There are two steps in the usual industrial preparation of acrylic acid, the immediate precursor of several useful plastics. in the first step, calcium carbide and water react to form acetylene and calcium hydroxide: cac2 (s) + 2h2o (g) → c2h2 (g) + caoh2 (s) =δh−414.kj in the second step, acetylene, carbon dioxide and water react to form acrylic acid: 6c2h2 (g) + 3co2 (g) + 4h2o (g) → 5ch2chco2h (g) =δh132.kj calculate the net change in enthalpy for the formation of one mole of acrylic acid from calcium carbide, water and carbon dioxide from these reactions. round your answer to the nearest kj .