calculate enthalpy change in the reaction 4NH3 + 3O2---> 2N2 + 6H20 at 298 k given that enthalpy of formation at 298k fir NH3 and H2O are -46 and - 286 kJ /mol Share with your friends Share 2 Mohan Kumar answered this Dear Students, Regards 7 View Full Answer Rajib answered this i found out my answer as follows.... 2