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Apr 24, 2021 · Vapor pressure (or vapour pressure) is the equilibrium pressure of a vapor above its liquid or solid state in a closed container. In this type of closed system, some molecules of a liquid or solid have enough kinetic energy to escape at the surface and enter the vapor (gas) phase.
Mar 13, 2023 · Vapor pressure is the pressure inside a closed container when a liquid is in equilibrium with its own gas phase so the rate of evaporation is equal to the rate of condensation. When a non-volatile solute is dissolved in a volatile solvent, the vapor pressure of the solvent is reduced.
1. Vapor Pressure Lowering. Calculate the vapor pressure of a solution at 25°C that is made by adding 47.9 g of glucose (C 6 H 12 O 6) to 340.0 mL of water. The vapor pressure of pure water at 25°C is 23.8 torr and the density of water is 1.00 g/mL.
Melting Line – These are the temperatures and pressures at which the solid and liquid phases are in equilibrium. Vaporization Line – These are the temperatures and pressures at which the liquid and gas phases are in equilibrium. Thus, this line gives the vapor pressure of the liquid.
Apr 12, 2023 · Key Takeaways. The equilibrium vapor pressure of a liquid depends on the temperature and the intermolecular forces present. The relationship between pressure, enthalpy of vaporization, and temperature is given by the Clausius-Clapeyron equation.
Feb 13, 2023 · The vapor pressure over a solution of urea (CH 4 N 2 O) is 291.2 mm Hg. The vapor pressure of pure water at the same temperature is 355.1 mm Hg. Calculate the mole fraction of urea in the solution. Don’t forget that Raoult’s law (as written above) is in terms of the mole fraction of water!
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What is vapor pressure?
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When water evaporates, it changes from a liquid to a gas (water vapor). Water vapor takes up more space than an equal mass of liquid water. As a result, in a closed container, the vapor that forms can exert a significant amount of pressure. This pressure is known as vapor pressure.
