Question

Select the compound in each of the following groups that hasthe highest standard molar entropy (Sdegree)...

Select the compound in each of the following groups that hasthe highest standard molar entropy (Sdegree)

A. C2H6(g) C3H8(g) CH4(g)

B. CCl4(l) CHCl3(l) CH2Cl2(l)

C. CO2(l) CO2(g) CS2(g)

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Answer #1

In general, more "complicated" molecules (i.e., molecules containing more atoms) have higher standard molar entropy than simpler molecules. If there are more atoms in a molecule, then there are more ways for the atoms in the molecule can vibrate (a monatomic has *no* vibrational modes available to it). If there are more ways the molecule can vibrate, there are more ways that energy can be distributed in the molecule, which means higher entropy.

In addition, the higher the molecular mass of a molecule, the higher the entropy. This trend is not as easily explained, as it is a quantum mechanical effect related to the effect of mass on the number of energy levels available to a molecule.

A. C3H8

B. CCl4

C. CS2

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