The enthalpy of hydrogenation for 1-pentene is +126 kJ/mol. The enthalpy of hydrogenation for 1, 3-pentadiene is +230 kJ/mole. Hence estimate the resonance energy of 1, 3-pentadiene.

If enthalpy change for hydrogention of ethylene is -132 "kJ"//"mole" and enthalpy of formation 1,3-butadience (g) and butane are 115 " kJ " and -140 "kJ"//"mole" respesctively then calculte resonance energy of 1,3-budadiene (in kJ).

If heat of hydrogenation of 1,3 - pentadiene and 1,4 - pentadiene are X and Y kcal respectively , heat of hydrogenation of 2,3 - pentadiene will be

The enthalpy of formation of water from hydrogen and oxygen is - 286 kJ mol^-1 . The enthalpy of decomposition of water into hydrogen and oxygen is:

The enthalpy of hydrogenation of cyclohexane is -119.5 kj*mol ^(-1) . If resonance energy of benzene is -150.4 kJ*mol^(-1) , estimate its enthalpy of hydrogenation.

The standard enthalpy of forrnation of NH_3 is 46 kJ mol^-1 .If the enthalpy of formation of H_2 from its atoms is -436 kJ mol^-1 and that of nitrogen is -712 kJ mol^1 ,the average bond enthalpy of N-H bond in NH_3 is

If enthalpy of hydrogenation of cyclohexene is [-x kJ mol^-1] and resonance energy of benzene is [-y kJ mol^-1] then the enthalpy of hydrogenation of benzene will be

The enthalpy of hydrogenation of cyclohexene is -119.5KJ . If resonance energy of benzene is -150.4KJMol^(-1) , its enthalpy of hydrogenation would be