Benzene is a liquid under standard conditions.The standard enthalpy and entropy change for the evaporation of liquid benzene to form benzene vapor are +33.9 kJ/mol and 96.3 J/mol . K,respectively.If liquid benzene is placed in a closed container at 78.85 $\circ$ C,which of the following statements is true?

Question

Quizplus · Accepted Answer

The standard enthalpy change for the evaporation of liquid benzene is positive, indicating that the process is endothermic and requires energy input. However, the positive entropy change shows that the process is spontaneous and favors the formation of vapor molecules. At a given temperature, there is a dynamic equilibrium between the liquid and vapor phases of a substance, and the equilibrium vapor pressure increases with temperature. At 78.85°C, the vapor pressure of benzene is lower than 1 bar, but the liquid benzene will still evaporate until the vapor pressure reaches equilibrium with the liquid phase, which means that choice B is the best answer. The other options are incorrect because they contradict the principles of thermodynamics and phase equilibrium.

Benzene Is a Liquid Under Standard Conditions ∘\circ∘ C,which of the Following Statements Is True? A)Liquid Benzene Will

Benzene Is a Liquid Under Standard Conditions $\circ$ C,which of the Following Statements Is True?
A)Liquid Benzene Will