For the reaction ${\mathrm{FeCO}}_3\left(\mathrm{s}\right)⟶\mathrm{FeO}\left(\mathrm{s}\right)+{\mathrm{CO}}_2\left(\mathrm{g}\right);\mathrm{\Delta H}=82.8\mathrm{kJ}\text{ at }{25}^{\circ }\mathrm{C}$ what is $\left(\mathrm{\Delta E}\text{ or }\mathrm{\Delta U}\right)$ at 25"C?

• A

   82.8 kJ 

• B

   30.32 kJ

• C

   -2394.77 kJ

• D

   85.28 kJ