Thermodynamics

Thermodynamics

Question

The standard enthalpy of formation (∆fHo)  at 298 K for methane, CH4(g), is –74.8 kJ mol–1. The additional information required to determine the average energy for C – H bond formation would be

  • the dissociation energy of H2 and enthalpy of sublimation of carbon

  • latent heat of vapourization of methane

  • the first four ionization energies of carbon and electron gain enthalpy of hydrogen

  • the dissociation energy of hydrogen molecule, H2

Answer

A.

the dissociation energy of H2 and enthalpy of sublimation of carbon

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