Energy is released when hydrogen and oxygen react to produce water. This energy comes from the fact that the final hydrogen-oxygen bonds represent a lower total energy states compared to the original hydrogen-hydrogen and oxygen-oxygen bonds. Calculate how much energy (in kilojoules per mole of product) is released by the reaction:

1/2 O2 + H2 → H2O

at constant pressure and given the following standard bond enthalp enthalpies denote the enthalpy absorbed when bonds are broken at ture and pressure (298 K and 1 atm).

H-H : 432 kJ/mol
O=O : 494 kJ/mol
H-O : 460 kJ/mol