8
AssignmentMultiple Choice

Heat

Question 8 • *25-26 KCS18 Chemistry IC

Which of the following correctly describes how to break this calculation into steps?

Answer
A
Cool liquid from 314 K to 263 K; freeze liquid at 263 K.
B
Cool liquid from 314 K to 273 K, freeze liquid at 273 K, and cool solid to 263 K.
C
Freeze liquid at 314 K; cool solid to 263 K.

Explanation

Water freezes at 273 K. Starting with liquid at 314 K, first cool it to 273 K, then freeze it at that temperature, and finally cool the solid from 273 K to 263 K. This matches choice B; freezing at 263 K or 314 K would place the phase change at the wrong temperature.

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