From the plot of vapor pressure as a function of temperature shown below,the normal boiling point for tert-butyl alcohol is approximately
A)0°C.
B)40°C.
C)85°C.
D)100°C.

Question

From the plot of vapor pressure as a function of temperature shown below,the normal boiling point for tert-butyl alcohol is approximately 
A)0°C. 
B)40°C. 
C)85°C. 
D)100°C.

Quizplus · Accepted Answer

The normal boiling point is the temperature at which the vapor pressure of the liquid is equal to the atmospheric pressure. From the graph, we can see that the vapor pressure of tert-butyl alcohol is approximately 760 mmHg (atmospheric pressure at sea level) at around 85°C. Therefore, the best answer choice is C, which corresponds to 85°C.

From the Plot of Vapor Pressure as a Function of Temperature