Are bond energies (single and multiple bonds) applicable only to gas phase?? For instance, I can use the bond energy data to calculate for enthalpy of reaction for the formation of water:

2 H2(g) + O2(g) -> H2O(g)
But I can't directly use it to calculate for neutralization of acid and base:
HCl(aq) + NaOH(aq) -> NaCl(aq) + H2O(l)

help please.

2 answers

See your post above on this.
how many atoms of each element are in the following examples( answers just below the problems, so carefully): KCI, Fe2O3, AI(N3O)3, NH4NO3,AI(SO4)3?