4) The magnitude of the electric field, E, at a distance r from a point charge Q is: [5] E=4πϵor2Q How close to a water molecule of polarizability volume 1.48×10−30 m3 must a proton approach before the dipole moment it induces is equal to the permanent dipole moment of the molecule (1.85 D).
5) a) Calculate the interaction energy for two methane molecules separated by nm. The polarizability volume of methane is 2.6×10−30 m3, and its ionisation energy is approximately 700 kJ mol−1. b) Compare your answer in part (a) to the enthalpy of vaporisation of methar which is 8.2 kJ mol−1. Account for the difference between these.
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