Which statement describes the normal boiling point of a substance?A The temperature at which the vapor pressure of a substance isgreater than the air pressure at sea level.BCDThe temperature at which the vapor pressure of a substance is lessthan the air pressure at sea level.SmThe temperature at which the vapor pressure of a substance equalsthe air pressure at sea level.The temperature at which the vapor pressure of a substance equalsthe air temperature at sea level.

Answered: Which statement describes the normal…

Chemistry for Engineering Students

4th Edition

ISBN:9781337398909

Author:Lawrence S. Brown, Tom Holme

Publisher:Lawrence S. Brown, Tom Holme

Chapter8: Molecules And Materials

Section: Chapter Questions

Problem 8.84PAE

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Question

Which statement describes the normal boiling point of a substance?
A The temperature at which the vapor pressure of a substance is
greater than the air pressure at sea level.
B
C
D
The temperature at which the vapor pressure of a substance is less
than the air pressure at sea level.
Sm
The temperature at which the vapor pressure of a substance equals
the air pressure at sea level.
The temperature at which the vapor pressure of a substance equals
the air temperature at sea level.

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The concept behind the answer is related to the vapor pressure of a substance and its relationship with the atmospheric pressure.

Vapor pressure is the pressure exerted by the vapor of a substance in equilibrium with its liquid or solid phase. At a given temperature, the vapor pressure of a substance is determined by the number of molecules escaping from the surface of the liquid and entering the vapor phase, as well as the number of molecules returning from the vapor phase to the liquid or solid phase.

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