Alkenes can undergo the addition of hydrogen in the presence of certain catalysts. The H of this

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Alkenes can undergo the addition of hydrogen in the presence of certain catalysts.R R C=C R R4 + H catalyst R R R-C-C-R4 1 T H H

The ΔH° of this reaction, called the enthalpy of hydrogenation, can be measured very accurately and can serve as a source of heats of formation. Consider the following enthalpies of hydrogenation: (E)-3-hexene, 2117.9 kJ mol–1 (28.2 kcal mol–1); (Z)-3-hexene, 2121.6 kJ mol–1 (29.1 kcal mol–1). Calculate the heats of formation of these two alkenes, given that the ΔH°f of hexane is 2167.2 kJ mol–1 (40.0 kcal mol–1).

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Organic Chemistry

ISBN: 9781936221349

6th Edition

Authors: Marc Loudon, Jim Parise

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