Question
Tue February 26, 2008 By:

Calculate the heat of formation of water?

Expert Reply
Sun March 02, 2008

H reacts with oxygen to form water. Calculate the heat of formation of water?

The bond energy of H-H ,  O=O and O-H are 435KJ 495KJ 460KJ respectively

435 + 1/2 495 = 682.5 is the energy absorbed to break existing bonds in reactants and 2x460=920 is the energy evolved in formation of 2 O-H bonds in water. heat of formation of water= -237.5kJ

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