From the following data at 25^(@)C, calculate the bond energyof O-H bond : (i) H_(2)g rarr 2H(g) ,Delta H _(1)= 104.2 kcal(ii) O_(2)(g) rarr 2O(g), Delta H _(2) = 118 . 4 kcal (iii)H_(2)(g) + (1)/(2) O_(2)(g)rarr H _(2)(g) , Delta H_(3) = - 57.8 kcal

From the following data at 25^(@)C, calculate the bond energyof O-H bo

1.	From the following data at 25^(@)C, calculate the bond energyof O-H bond : (i) H_(2)g rarr 2H(g) ,Delta H _(1)= 104.2 kcal(ii) O_(2)(g) rarr 2O(g), Delta H _(2) = 118 . 4 kcal (iii)H_(2)(g) + (1)/(2) O_(2)(g)rarr H _(2)(g) , Delta H_(3) = - 57.8 kcal
Answer» Solution :For REACTION (III) `:Delta_(r) H^(@) =Delta _(H-H) H^(@) + (1)/(2) Delta _(O=O) H^(@)- 2DELTA _(O-H) H^(@)` `- 57.8 =104.2 + ( 1)/(2) xx 118.4 - 2 xx B.E. ( O-H)` or`2 xx B.E. ( O-H) = 221. 2 kcal`or ` B.E. ( O-H) = 110.6 kcal`