30.4986815-4.97×10⁵=
30.4986815-497000=
-496969.5013185.
3110g=3.11kg.
Specific heat of water=4200J/kg/℃.
So 3.11kg requires 13062J to raise the temperature 1℃.
4.97×10⁵=497000J. This is enough energy to raise the water 497000/13062=38.05℃. Since water boils at 100℃, the temperature of the water must have been 100-38.05=61.95℃.
This assumes that the water reaches boiling point, but does not actually boil, so we don’t have to consider the latent heat of vaporisation.