CHEMISTRY · Multi-part · CBSE · Chemistry · Matter in Our Surroundings · Matter in Our Surroundings
Problem
Carbon dioxide exists as a solid (dry ice), a liquid (under pressure), and a gas. Consider three 1.0-mol samples of CO₂, each at the same temperature of 195 K but at the pressures required to maintain the solid, liquid, or gaseous phase, respectively.
(a) Rank the molar entropies of the three samples from lowest to highest.
(b) Describe, in terms of the distribution of matter and molecular motion, the particle-level reasons for the ranking you gave in part (a). Your explanation should refer explicitly to how freedom of motion and occupied volume differ among the three phases.