Lt x y 3 x y HEAT OF FORMATION 107 Since the enthalpy of the

Last updated: 7/2/2023

Lt x y 3 x y HEAT OF FORMATION 107 Since the enthalpy of the elements in their standard states is taken to be zero The heat of 108 Reaction H s I g formation AH of compounds 1 Is always negative 2 Is always positive 3 Is zero 4 May be positive or negative 2 x y 4 More data required 242 2HI AH 12 40 kCal According to this heat of formation of HI will be 1 12 40 kCal 3 6 20 kCal abe of akso 1 3201 kJ 109 At 300K the standard enthalpies of formation of CH COOH CO2 and H Oare 408 393 and 286 kJ mol respectively Calculate the heat of combustion of benzoic acid at contant volume 2 3199 75 kJ L 3201 kJ 4 3199 75 kJ 2 12 40 kCal 4 6 20 kCal Brow 114 C C fo 1 115 TI C 2 he 1 3 116 T EES m m 1 2 117