43. A closed flask contains a substance in all its three States , solid, liquid, and vapour at its triple point . in this situation the average KE of the water molecule will be

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Solution

Kinetic energy is a function of temperature and during a phase change the temperature remains the same and hence the kinetic energy remains same.
At triple point, all the forms are at same temperature and hence they have same kinetic energy.
Since, the system is at equilibrium, the (Gibbs) free energy (a thermodynamic quantity) of each phase is also exactly the same.

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