Question 13 Not yet answered Marked out of 1.50 Flag question Calculate the standard enthalpy of reaction for the process 2 NO, (g) + 7 H2(g) + 2NH2(g) + 4 H 0(9) based on the following standard enthalpies of formation: AHf[NH3(9)] = -46.1 kJ/mol; AHf[NO_(9)] = +33.2 kJ/mol; and AHf[H20(9)] = -241.8 kJ/mol. Select one: a. -993.1 kJ b. -808.4 kJ C.-254.7 kJ d. -1125.8 kJ