Linnea Asked :
Q. Which of the following is true about vapor pressure of a liquid?
A. Vapor pressure is closely related to molecular activity but independent of the temperature of the liquid
B. Vapor pressure is not affected by molecular activity and temperature of the liquid
C. Vapor pressure is not affected by molecular activity and is independent of the temperature of the liquid
D. Vapor pressure is closely related to molecular activity and temperature of the liquid
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Explanation: The vapor pressure of a liquid at a given temperature is given by the pressure exerted by the saturated vapor on the liquid surface. When the vapor is saturated, an equilibrium exists between the liquid and the vapor phases. The number of molecules leaving the liquid surface is equal to the number of molecules entering the liquid surface. Hence, it is obvious that vapor pressure will be related to molecular activity and consequently to temperature. With the increase in temperature molecular activity increases as a result of which vapor pressure increases.