Chapter 14 Multiple choice questions

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This question is concerned with residual entropy, specifically that shown in the molecule CH₃F. Which one of the following statements is correct?

The residual entropy can be expected to be very close to 11.52 J K^-1 mol^-1. correct incorrect

The residual entropy can be expected to be larger than 11.52 J K^-1 mol^-1 correct incorrect

The residual entropy can be expected to be smaller than 11.52 J K^-1 mol^-1 correct incorrect

One cannot say anything about the potential residual entropy, since there may be low-lying phase transitions in CH₃F, such as e.g. dimerization. correct incorrect

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This question is concerned with heat capacity as a function of temperature for D₂ and H₂, with reference to the behaviour of HD, which shown in Fig 14.1.

Which one of the following statements is correct?

The maximum in C_V,m due to the rotational degrees of freedom acting as a 2-level system for H₂ will happen at a lower temperature than in HD. correct incorrect

The maximum in C_V,m close to the temperature θrot that results from the rotational degrees of freedom acting as a 2-level system in D₂ will happen at a higher temperature than in HD. correct incorrect

There will be no maximum in C_V,m for D₂ as a result of rotational degrees of freedom acting as a 2-level system as in HD. correct incorrect

The maximum in C_V,m close to the temperature θrot that results from the rotational degrees of freedom acting as a 2-level system in D₂ will happen at a lower temperature than in HD. correct incorrect

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