Calculate the change of enthalpy for the reaction CH4 g NH3 g HCN g 3H2 g from the following reactions Reaction 1 N g 3H2 g 2NH3 g Change in enthalpy 91 8 kJ mol Reaction 2 C s graphite 2H2 g CH4 g Change in enthalply 74 9 kJ mol Reaction 3 H g 2C s graphite N g 2HCN g Change in enthalpy 270 3 kJ mol To earn FULL POINTS you need to include ALL YOUR WORK used to complete the calculation the correct calculated value AND the correct units