The enthalpy of dissociation of gaseous methane and ethane are 400 and670KJ`mol^(-1) `respectively .Determine the amount of energy needed to break one mole of C-C bonds.
A)270KJ
B)70KJ
C)200KJ
D)240KJ

The bond energies of C=C and C-C at 298 K are 590 and 331 kJ mol^(-1) , respectively. The enthalpy of polymerisation per mole of ethaylene is

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"

If the electron gain enthalpy of S and Se are -200 KJ " mol"^(-1) and -195 KJ " mol"^(-1) respectively. Wha is the electron gain enthalpy of O atom?

If the enthalpy of combustion of C (graphite) is -393.3kJ mol^(-1) , then for producing 39.3kJ of heat the amount of carbon required is

The enthalpies of combustion of C_(("graphite")) and C_(("diamond")) are -393.5 and -395.4kJ//mol respectively. The enthalpy of conversion of C_(("graphite")) to C_(("diamond")) in kJ/mol is: