Question

The enthalpy changes at $298K$ in successive breaking of $O-H$ bonds of water are

$H_{2}O\left(g\right)\to H\left(g\right)+OH\left(g\right);\Delta H=498kJ$ ${mol}^{-1}$

$OH\left(g\right)\to H\left(g\right)+O\left(g\right);\Delta H=428kJ$ ${mol}^{-1}$

The bond enthalpy of $O-H$ bond is:

• A. $498kJ$ ${mol}^{-1}$
• B. $428kJ$ ${mol}^{-1}$
• C. $70kJ$ ${mol}^{-1}$
• D. $463kJ$ ${mol}^{-1}$

Answer 1

The correct option is D $463kJ$ ${mol}^{-1}$