Exothermic reactions These are those reactions which are accompanied by the evolution of heat. The quantity of heat produced is shown along with the products with a plus sign. For Ex: C ( s) + O2 (g) ------> CO2 ( g) + 395.3 kJ H2 (g) + ½ O2 (g) --------> H2O ( l ) + 285.8 KJ N2 ( g ) + 3 H2 ( g ) --------> 2 NH3 ( g ) + 92.4 KJ CH4 ( g ) + 2 O2 … [Read more...] about Exothermic And Endothermic Reaction