Consider the following reaction :-
$2{\mathrm{H}}_2\left(\mathrm{g}\right)+{\mathrm{O}}_2\left(\mathrm{g}\right)\to 2{\mathrm{H}}_2\mathrm{O}\left(\mathrm{g}\right){\mathrm{\Delta }}_{\mathrm{r}}{\mathrm{H}}^{\circ }=-483.64\mathrm{kJ}$
What is the enthalpy change for decomposition of one mole of water? (Choose the right option).