Use the graph of vapor pressure to determine the normal boiling point of O₂. A) 84 K B) 88 K C) 90 K D) 92 K E) O₂ doesn't boil because it is always a gas.

Question

Quizplus · Accepted Answer

The normal boiling point is defined as the temperature at which the vapor pressure of the liquid equals the atmospheric pressure. From the graph, we can see that the vapor pressure of O₂ is equal to 0.1 atm at around 90 K. This means that at 90 K, the vapor pressure of the liquid O₂ would be equal to atmospheric pressure (1 atm), causing the liquid to boil. Therefore, the normal boiling point of O₂ is 90 K.

Use the Graph of Vapor Pressure to Determine the Normal