The standard formation reaction for N₂O₅(g) is shown below.

N₂(g) + 5/2 O₂(g) N₂O₅(g)

Use Hesss law and the following data to calculate the standard enthalpy of formation of N₂O₅(g).

(I) 2 NO₂(g) 2 NO(g) + O₂(g) DH_I⁰= +114.1 kJ.mol^-1

(II) 4 NO₂(g) + O₂(g) 2 N₂O₅(g) DH_II⁰= -110.2 kJ.mol^-1

(III) N₂(g) + O₂(g) 2 NO(g) DH_III⁰= +180.5 kJ.mol^-1