How to Tackle Vapor Pressure Related Questions – Part 1

Vapor pressure or equilibrium vapor pressure, an indication of a liquid's thermodynamic tendency to evaporate, is the pressure exerted by a vapor in thermodynamic equilibrium with its condensed phases (solid/liquid) at a given temperature in a closed system.


Boyle's law aka the Boyle–Mariotte law or Mariotte's law states that the absolute pressure exerted by a given mass of an ideal gas is inversely proportional to the volume it occupies if the temperature and amount of gas remain unchanged within a closed system.

Question:

A liquid is in equilibrium with its vapor in a sealed container at a fixed temperature. The volume of the container is suddenly increased.

a) What is the initial effect of the change on vapor pressure?

b) How do rates of evaporation and condensation change initially?

c) What happens when equilibrium is restored finally and what will be the final vapor pressure?

Solution: 



Click to enlarge the image

Did I vapor you to death now or you are at equilibrium❓ Let Chemaficionado know at mychemistryhomework@gmail.com❗

References:

(1)    Wikipedia Contributors. Chemical equilibrium. Wikipedia. https://en.wikipedia.org/wiki/Chemical_equilibrium.

(2)    Phase transition. Wikipedia. https://en.wikipedia.org/wiki/Phase_transition.

(‌3)    Wikipedia Contributors. Vapor pressure. Wikipedia. https://en.wikipedia.org/wiki/Vapor_pressure.

‌(4)    Wikipedia Contributors. Boyle’s law. Wikipedia. https://en.wikipedia.org/wiki/Boyle%27s_law.

(5)    Ncert. Chemistry : Textbook for Class XI - Part.I; National Council Of Educational Research And Training: New Delhi.

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