What is the molar energy of combustion (in kJ/mol) of C7H.O2 when 2.50 g of G7HGO2 burns completely in excess O2 gas at constant pressure and 298 K, it releases -30.9 kJ of energy. 2C7H6O2 + 15 O2 + 14 CO2 + 6H2O Select one: a. 1.59 x 103 kJmol-1 O b. 1.59 10 kJmol-1 O c. 1590 kJmol-1 O d. 1.59 x 105 kJmol-1