Calculate the heat of formation of water?

Asked by  | 26th Feb, 2008, 04:07: PM

Expert Answer:

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

Answered by  | 2nd Mar, 2008, 07:09: PM

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