rank-each-set-of-substances-in-order-of-increasing-standard-molar-entropy-s-expl

Question

Rank each set of substances in order of increasing standard molar entropy (S°). Explain your reasoning. NH₃(g); Ar(g); SeO₂(g); CH₃CH₂CH₂OH(g); Kr(g)

Accepted Answer

Ar(g) < Kr(g) < SeO₂(g) < NH₃(g) < CH₃CH₂CH₂OH(g)

A more complex substance will have greater entropy. When two substances have similar complexity, the substance with greater mass will have greater entropy.

Answer

NH₃(g) < Ar(g) < CH₃CH₂CH₂OH(g) < Kr(g) < SeO₂(g)

A substance with greater mass will have greater entropy regardless of the complexity of the substance.

Answer

CH₃CH₂CH₂OH(g) < NH₃(g) < SeO₂(g) < Kr(g) < Ar(g)

A less complex substance will have greater entropy. When two substances have similar complexity, the substance with greater mass will have lesser entropy.

Answer

SeO₂(g) < Kr(g) < CH₃CH₂CH₂OH(g) < Ar(g) < NH₃(g)

A substance with lesser mass will have greater entropy regardless of the complexity of the substance.

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