ASSAP PLEASE!!!

Given the reaction: 4NH3(g) +502(g) - 4NO(g) + 6H 0(9) (a) Calculate the enthalpy of the above reaction, AH am using the following thermochemical equations: Nzg) + 3H2(g) - 2NH3(g) AH, = -91.8 kJ N2(g) + O2(g) - 2NO(g) AH, = +1806) 2H2(g) + O2(g) - 2H2O(g) AH, = - 483.7 k) (b) is the reaction exothermic or endothermic? (If your are going to submit a handwritten answer for this question at the end of the exam, give your final answer in the text box below)