Benzene is a liquid under standard conditions. The standard free-energy change f

Question

Benzene is a liquid under standard conditions. The standard free-energy change for the evaporation of liquid benzene to form benzene vapor is +5.2 kJ/mol. If liquid benzene is placed in an open container under standard conditions, ________

a. it will partially evaporate with the equilibrium vapor pressure being less than 1 bar.

b. it will completely evaporate.

c. it will partially evaporate with the equilibrium vapor pressure being greater than 1 bar.

d. it will not evaporate.

e. it will partially evaporate with the equilibrium vapor pressure being equal to 1 bar.

which is the best answer?

Explanation / Answer

Any liquid will evaporate when the vapor pressure of liquid is equal to vapor pressure of atmosperic pressure. At this atmospheric pressure liquid is equilibrium with vapor. That means liquid partially evaporated.

So among the given statements

e) it will partially evaporate with the equilibrium vapor pressure being equal to 1 bar is the best answer

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