# Worksheet: Boiling Points at Varying Pressure

In this worksheet, we will practice using the Clausius–Clapeyron equation to calculate the boiling point of a liquid at different pressures.

Q1:

Under 101.3 kPa of atmospheric pressure, the boiling point of benzene is and its enthalpy of vaporization is 30.8 kJ/mol. Estimate to two significant figures the boiling point of benzene at a pressure of 83.4 kPa.

Q2:

Under 101.3 kPa of atmospheric pressure, the boiling point of water is and the enthalpy of vaporization is 40.7 kJ/mol. Estimate to the nearest degree Celsius the boiling point of water at a pressure of 83.4 kPa.

Q3:

Which of the following statements is true?

• AIt usually takes longer to cook food in boiling water at lower altitudes.
• BPerspiration cools the body because vaporization is an exothermic process.
• CThe enthalpy of vaporization is usually larger than the enthalpy of sublimation.
• DThe enthalpy of fusion is usually larger than the enthalpy of vaporization.
• EThe enthalpy of vaporization decreases with increasing temperature.