Question

You know that an unlabeled water bottle contains at least some water. You measure the freezing point of the unknown substance and find that it freezes at a temperature lower than 0 degrees Celsius at 1 atmosphere pressure. Which of the following can you conclude?

A. The substance is pure water.

B. The substance will have a boiling point that is less than 100 degrees Celsius.

C. The substance will have a vapor pressure that is greater than that of pure water.

D. The substance is an aqueous solution.

Answer 1

C, since it freezes at a lower temperature, it takes less energy to make the substance into a gas, so therefore it has a greater vapor pressure