The latent heat of fusion and the latent heat of vaporizatio

The latent heat of fusion and the latent heat of vaporization of neon at the triple point have the values 335 J/mol and 1803 J/mol respectively. The temperature of the triple point is 24.57 K. What is the latent heat of sublimation of neon at the triple point? What is the change in entropy when one mole of liquid neon at the triple point is vaporized?

Solution

The latent heat of sublimation at triple point is (335+1803)J/mol=2138 J/mol.

Heat abosrbed to vaporize 1 mole of liquid neon is 1803 J. The temperature of the process is 24.57 K. So change in entropy is, 1803/24.57 J/K=73.38 J/K.