The tutor gives a brief idea about entropy.

Entropy is, according to one of my chemistry professors, the “degree of disorder.” Entropy measures the randomness, or chaos, of a given system. Its unit is J/(mol*(deg Kelvin))

A solid structure is more orderly than a gas, so its entropy is much less. For instance, at 25C, solid iron has entropy 27.2J/(mol*K). Carbon dioxide, by comparison, has entropy 213.6J/(mol*K).

Why entropy is an important concept in chemistry, I’ll begin to cover in future posts:)

Source:

Mortimer, Charles E. Chemistry, sixth ed. Belmont: Wadsworth, 1986.

Jack of Oracle Tutoring by Jack and Diane, Campbell River, BC.