Question

The vapor pressures of water, acetone, and ethanol at `293K` are `2.34, 12.36`, and `5.85 kPa`, respectively. Which of the following statements is correct?
A. Acetone has the lowest boiling point.
B. Water has the highest boiling point.
C. Water evaporates the least in a sealed container at `293K` before equilibrium is established.
D. All of these

Answer 1

Correct Answer - D
When the temperature rises, the vapor pressure of a liquid also rises. At boiling point, the vapor pressure becomes equal to the atmospheric pressure. A liquid with lower vapor pressure will require higher temperature to attain its vapor pressure will require higher temperature to attain its vapor pressure equal to the atmospheric pressure. Thus, the liquid with the lowest vapor pressure will have the highest boiling point.