PP Presentation
Energy for bond breaking:
4 mol O—H bonds = 4 (464 kJ)
2 mol O—O bonds = 2 (138 kJ)
TOTAL = 2132 kJ
Energy from bond making :
1 mol O=O bonds = 498 kJ
4 mol O—H bonds = 4 (464 kJ)
TOTAL = 2354 kJ
EXAMPLE 2: Estimate the energy of the reaction
2 H—O—O—H ----> O=O + 2 H—O—H
- Which is larger: energy req’d to break bonds . . .
or energy evolved on making bonds?