Question

The normal boiling point and freezing points of argon are 87.3 K and 84.0 K. The triple point is at 82.7 K and 0.68 atmosphere.Does the liquid phase of argon have a density greater than, equal to, or less than the density of the solid phase? Explain your answer using the info provided above.

Answer 1

According to the information provided in the question, we can conclude that the liquid phase is LESS DENSE than the solid phase, and this is due to the freezing point of argon being higher than the triple point temperature, and with increasing pressure, the liquid argon will become solid, and since increasing pressure favors a denser phase, solid argon must be the denser phase as well.