The total surface area of Asia consisting of forest, cultivated land, grass land, and desert is 4.46 × 10⁷ km². Every year, the mass of carbon fixed by photosynthesis by vegetation covering this land surface according to the reaction 6CO₂(g) + 6H₂O(l) → C₆H₁₂O₆(s) + 6O₂(g) is about 455 × 10³ kg km⁻². Calculate the annual enthalpy change resulting from photosynthetic carbon fixation over the land surface per mole of carbon given the data above. Assume P = 1 bar and T = 298 K.