8 8.25 Which would you expect to have a higher molar entropy at T = 0, single cr

Question

8 8.25 Which would you expect to have a higher molar entropy at T = 0, single crystals of BF3 or of C0F2? Why? 8.29 Which substance in each of the following pairs has the higher molar entropy at 298 K: (a) HBre) or HF(g); (b) 3(g) or Ne(g); (c) I2(s) ((Dol); (d) 1.0 mo (g) at 1.00 atm 1.0momg) at 1.00 or 1.0 mol Ar(g) at 2.00 atm? 8.33 Which substance in each of the following pairs would you expect to have the higher standard molar entropy at 298 K? Explain your reasoning. (a) lodine vapor or bromine vapor (b) the two-liquids cyclopentane and l(pentene (see structures); (c) ethene ferhylene) or an equivalent mass of polyethylene, a ,, the polymerization of thylene.

Explanation / Answer

In general, 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 monoatomic has no vibrational modes available to it.) . If there are more ways the molecules can vibrate, there are more ways that energy can be distributed in the molcule, which means higher entropy.

Since NH3 has more atoms in a molecule than Ne, thus it will have more degrees of freedom which will lead to higher entropy than Ne.

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