Acetone can be easily converted to isopropyl alcohol by addition of hydrogen to the carbon–oxygen double bond. calculate the enthalpy of reaction using the bond energies given. bond: c=o h–h c–h o–h c–c c–o bond energy (kj/mol): 745 432 413 467 347 358

Enthalpy is delta-H- We need to look at the molecule and determine which bonds are broken adn which bonds are formed. Bonds that are broken are H-H (from the H2 molecule) and the C=O from acetone. their energies add up like this: 436 kJ + 745 kJ = 1181 kJ looking at the bonds formed, these are C-O, O-H, and C-H. these add up to 1229 kJ solving for delta H by taking the sum of the broken bonds and subtracting the sum of the formed bonds, like so: 1181 - 1229 = -48 kJ

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