At 25 ° C , the enthalpy of the following processes are given: H _...

At $25 ° C$, the enthalpy of the following processes are given:

${H}_{2} ( g ) + {O}_{2} ( g ) \to 2OH ( g ) \Delta{H}^{o} = 78kJ{mol}^{- 1}$

${H}_{2} ( g ) + 1 / 2{O}_{2} ( g ) \to {H}_{2}O ( g ) \Delta{H}^{0} = - 242kJ{mol}^{- 1}$

${H}_{2} ( g ) \to 2H ( g ) \Delta{H}^{o} = 436kJ{mol}^{- 1}$

$1 / 2{O}_{2} ( g ) \to O ( g ) \Delta{H}^{0} = 249kJ{mol}^{- 1}$

What would be the value of X for the following reaction? (Nearest integer)

${H}_{2}O\left(g\right) \to H\left(g\right) + OH\left(g\right) ∆ {H}^{o} = X{kJmol}^{- 1}$