For the change `H_2 O_((l)) to H_2 O_((g))` , P=1 atm, T=373 K, the free energy change `Delta G`=0. This indicates that ____________ .

For the equilibrium H_(2)O(l) iff H_(2)O(g) at 1 atm and 298 K

For the reaction H_(2)O_((i))hArrH_(2)O_((g)) at 373 K and 1 atmospheric pressure

The H_2 O_((g)) molecule dissociates as (i) H_2 O_((g)) to H_((g)) + OH_((g)) , Delta H=490 kJ (ii) OH_((g)) to H_((g)) + O_((g)) , Delta H=424 kJ The average bond energy (in kJ) for water is ____________ .