[" RESONANCEENERGY "],[" (31) The enthalpy of formation of ettane,ettuyene and benzene from the gaseous atoms are - "2839,2],[quad -2275.2" and - "5500" Kdsmot- respectivel caccuate the ressonance energy of for zend enthe bond enthapy "],[" c-Hbond is given as equalto "+410.87kymol]

The enthalpy of formation of enthane and benzene from the gaseous atoms are -2839.2 and -5506 kJ//mol respectively. Bond enthalpy of C = C bond is Given: Resonance energy of benzene =-23.68" kJ/mol" Bond enthalpy of C-H bond =411.0" kJ/mol"

The heat of dissociation of benzene in isolated gaseous atoms is 5335 kJ/mol . The bond enthalpies C-C, C = C and C - H bonds are 347.3, 615 and 416.2 kJ respectively. Magnitude of resonance energy of benzene is

The heat of dissociation of benzene in isolated gaseous atoms is 5335 kJ/mol . The bond enthalpies C-C, C = C and C - H bonds are 347.3, 615 and 416.2 kJ respectively. Magnitude of resonance energy of benzene is

Hess's law of heat of summatiion is based on law of conservation of energy. It has found significance in deriving heats of many reactions which either do not take place or if take place, than other side reactions also accompany it. For example heat of reaction for C+(1)/(2)O_(2) rarr CO can not be studied directly as it occurs with simultaneous reaction of oxidation of CO to CO_(2) . Bond energy is referred as heat enthalpy when a bond is broken to produce isolated gaseous atoms. In case of breaking up of bonds between unlike atoms e.g., C-H bond in CH_(4) , bond energy is referred as avarage bond energy as four C-H bonds are broken up. Which of the following statements are correct ? (1) The dissociation of a ond is always endothermic (2) The formation of a bond is always exothermic. (3) Heat of formation of an atom =1//2xx bond energy like atoms covalent bond. (4) The heat enthalpy change in a chemical reaction is equal but opposite to the heat enthalpy if reaction is reversed. (5) Hess's law can be verified experimentally.