Question

consider the phase diagram below.

what is the normal boiling point of this substance?

60°c
0°c
23°c
50°c

Explanation:

Step1: Recall normal boiling point definition

Normal boiling point is the temperature at which a substance boils at 1 atm pressure.

Step2: Analyze the phase diagram

Locate the pressure of 1 atm (y - axis) and find the intersection with the liquid - gas equilibrium curve (the curve where phase change between liquid and gas occurs). Then find the corresponding temperature on the x - axis. From the phase diagram, at 1 atm, the temperature corresponding to the liquid - gas phase transition (boiling) is around \(23^{\circ}\text{C}\).

Answer:

\(23^{\circ}\text{C}\) (the option with \(23^{\circ}\text{C}\), assuming the options are labeled as per the given choices, e.g., if the option with \(23^{\circ}\text{C}\) is the third one, then the answer is the option with \(23^{\circ}\text{C}\))