Discussion
Consider the following statements about using heat capacity correlations.
1. The temperature must be in the units the correlation was fitted for.
2. Extrapolating far outside the fitted range is unreliable.
3. The correlation may be used for any substance of similar molar mass.
Answer: D
The first two are correct and are basic care with correlations. The third is wrong, since heat capacity depends on molecular structure rather than on molar mass alone. Two isomers of one formula can differ appreciably.
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