Describe liquid-vapour equilibrium

Consider the following liquid-vapour equilibrium. "Liquid" hArr "Vapour" Which of the following relations is correct?

An isolated system comprises the liquid in equilibrium with vapours. At this stage, the molar entropy of the vapour is

A cylinder fitted with a movable piston contains liquid water in equilibrium with water vapour at 25^(@)C . Which of the following operation results in a decrease in the equilibrium vapour pressure at 25^(@) C?

A cylinder fitted with a movable piston contains liquid water in equilibrium with water vapour at 25^(@)"C" . Which of the following operation result will not in a decrease in the equilibrium vapour pressure at 25^(@)"C" ?

A cylinder filled with a movable piston contains liquid water in equilibrium with water vapour at 25^@C . Which one of the following operations results in a decrease in the equilibrium vapour pressure ?