The bond enthalpies of D-Dand O-O and D-O are respectively, + 440, +498 and + 491.5 kJ mol^(-1). Calculate DeltaH for the reaction D_(2(g)) + 1/2 O_(2(g)) to D_2O_((l))

The bond enthalpies of D-Dand O-O and D-O are respectively, + 440, +49

1.	The bond enthalpies of D-Dand O-O and D-O are respectively, + 440, +498 and + 491.5 kJ mol^(-1). Calculate DeltaH for the reaction D_(2(g)) + 1/2 O_(2(g)) to D_2O_((l))
Answer» SOLUTION :Heat of reaction, `DeltaH `= (ENTHALPY of bonds dissoicated) - (Enthalpy of bonds FORMED) `DeltaH = (440 + 498/2) - (2 xx 491.5)` `= 689 - 983 = -294 kJ` Enthalpy of the GIVEN reaction is -294 kJ.