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, ________

Question

Quizplus · Accepted Answer

The standard free-energy change for evaporation of liquid benzene is positive, indicating that the process is not spontaneous under standard conditions. However, when liquid benzene is placed in an open container, it will undergo partial evaporation to establish an equilibrium vapor pressure. The equilibrium vapor pressure of benzene will be less than 1 bar because the standard state condition for gases is 1 bar. Therefore, option B is the best choice.

Benzene Is a Liquid Under Standard Conditions