The Freezing Point of Helium Is Approximately -270°C

question 30

Multiple Choice

The freezing point of helium is approximately -270°C. The freezing point of xenon is -112°C. Both of these are in the noble gas family. Which of the following statements is supported by these data?

• A) Helium and xenon form highly polar molecules.
• B) As the molar mass of the noble gas increases, the freezing point decreases.
• C) The London forces between the helium molecules are greater than the London forces between the xenon molecules.
• D) The London forces between the helium molecules are less than the London forces between the xenon molecules.
• E) none of these

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