Vapor pressure or equilibrium vapor pressure is defined as the pressure exerted by a vapor in thermodynamic equilibrium with its condensed phases at a given temperature in a closed system. The equilibrium vapor pressure is an indication of a liquid's evaporation rate. vapour pressure class 11 Class 11 Chemistry States of Matter Vapour Pressure. Vapour Pressure. June 29, 2017 By Mrs Shilpi Nagpal Leave a Comment. Vapour pressure of a liquid at any temperature may be defined as the pressure exerted by the vapour present above the
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For CBSE Class 11 and Class 12, subjects available are Physics and Chemistry. Apart from CBSE Board, LearnFatafat offers courses for JEE, NEET, CET, and various olympiads. Other Boards courses available are Karnataka Board Class 10 Mathemtics and Science. This pressure is due to vapour molecules of the liquid and, hence, is known as the vapour pressure of the liquid. Since this pressure is constant, it follows that there must be a constant number of molecules in the space above the liquid. The vapour pressure of liquid in solution is known as its partial vapour pressure and is less than the vapour pressure of the pure liquid at the same temperature. , If p be the vapour pressure of pure liquid and p s be that of liquid in solution then, lowering of vapour pressure of the liquid p p s; Raoults Law vapour pressure class 11 CBSE Class 12 Chemistry Notes: Solutions Vapour Pressure. Vapour pressure is the pressure exerted by vapours when they are in equilibrium with the liquid phase at a given temperature. It depends on the nature of the liquid and temperature. Vapour pressure of pure liquid is always greater than the vapour pressure of its solution. Vapour The reduction in vapour pressure of solvent is (pi pi) 3(111) 2 where 2 is the mole fraction of the solute. orn) X2 (1) Ap The expression is known as Relative lowering of vapour pressure (RLVP) of the solution The relative lowering of vapour pressure of the solution is equal to the mole fraction of the nonvolatile solute Equation (1) can It reaches a stage where the rate of evaporation is equal to the rate of condensation. This phase is called the stage of equilibrium. As represented by the manometer, at this point the pressure exerted by the molecules is called the vapor pressure of the liquid. Vapour pressure is defined as the pressure exerted by the vapor present above the liquid. Jan 15, 2013 Chemistry States of Matter part 18 (Vapour pressure) CBSE class 11 XI.