- Messages
- 104
- Reaction score
- 892
- Points
- 93
Okay, since it's bond energy, it's always +ve, energy is taken in to break the bond, that eliminates C ... now X-Y should be broken completely to form a certain amount of only X and a certain amount of only Y. That eliminates B. Now A and D. In D, the bond Y-Y is reformed, do that does not give us the exact enthalpy of X-Y as energy is released. Which leaved A, in which a whole no. of moles of only X and only Y