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Topic: Equilibrium vapor pressure

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	Vapor pressure - Wikipedia, the free encyclopedia
		Vapor pressure is the pressure of a vapor in equilibrium with its non-vapor phases.
		This is the equilibrium vapor pressure or saturation vapor pressure of that substance at that temperature.
		In the case of an equilibrium solid, such as a crystal, this can be defined as the pressure when the rate of sublimation of a solid matches the rate of deposition of its vapor phase.
	en.wikipedia.org /wiki/Vapor_pressure (607 words)

	Vapor Pressure Acetone -- Recommendations and Resources (Site not responding. Last check: 2007-10-12)
		At any given pressure, the boiling point of a substance is the temperature at which the vapor pressure of the substance ''in liquid form'' equals the total ambient pressure.
		Thus, at any given pressure, the sublimation point of a substance is the temperature at which the vapor pressure of the substance ''in solid form'' equals the ambient pressure.
		It is the vapor pressure usually found over liquid water, and is a dynamic equilibrium where condensation of water equals the evaporation of water.
	www.becomingapediatrician.com /health/156/vapor-pressure-acetone.html (1774 words)

	D:\chem1112\1112VAP2.htm
		The vapor pressure of a liquid depends upon the molecular structure of the liquid and upon the temperature.
		The vapor pressures of butane and acetone at 25C, respectively are: 1735 mm Hg and 200.
		That is, measure the vapor pressure of ethanol, hexane and heptane at room temperatrue twice and measure the vapor pressure of heptane near OºC twice.
	wwwchem.csustan.edu /chem1112/1112vap2.htm (2137 words)

	Vapor pressure of a pure liquid
		The equilibrium vapor temperature of the liquid (in this case, water) is read with a thermocouple circuit, the measuring junction of which is placed in the vapor of the boiling liquid at the top of a Cottrell pump.
		The voltage output from the pressure transducer will correspond to the pressure difference between the system and atmospheric pressure, so it will be necessary to record both the offset voltage from the transducer before the experiment begins, and the barometric pressure from the laboratory barometer.
		Once the water has begun to boil, be sure that the pressure and temperature remain relatively constant (for a period of about 5 minutes to ensure thermal equilibrium) and collect a pair of data which are a voltage corresponding to the pressure, and the celcius temperature.
	www.sou.edu /chem/ch444/vappress.htm (983 words)

	The Drive to Make Things Happen
		At any temperature, equilibrium exists when the escaping tendency (or free energy per mole) of molecules in the liquid and vapor is the same.
		The vapor pressure of water at room temperature (25° C) is 0.0313 atm, or 23.8 mm of mercury (760 mm Hg = 1 atm).
		The way in which equilibrium vapor pressure changes with temperature is shown in the graph on the right.
	www.chem.ox.ac.uk /vrchemistry/potential/Text/solutions3.htm (232 words)

	Vapor Pressure Experiment
		The pressure exerted by the water vapor can be determine by measuring the height of the column of mercury and subtracting that height from the original height of the column before adding the water sample.
		The pressure is the equilibrium vapor pressure of water at the temperature of the room (room temperature).
		The vapor pressure of the ethyl alcohol is greater than the vapor pressure of water at the same temperature.
	intro.chem.okstate.edu /PLE482701/ExpertVaporPressure.html (728 words)

	Thinking It Through 11.5 (Site not responding. Last check: 2007-10-12)
		After waiting for a time period sufficient for the water to have reached equilibrium with it vapor it was discovered that the vapor pressure of water was less than the equilibrium vapor pressure.
		The equilibrium vapor pressure for water at any given temperature is the water vapor pressure at which the rate of condensation of water vapor equals the rate of evaporation of the liquid.
		As more water molecules enter the vapor phase the vapor pressure of water increases until there are sufficient molecules colliding with the liquid surface and condensing to equal the rate of evaporation.
	wiley.com /college/chem/brady184764/resources/ch11/think_ans11.10.html (246 words)

	Water droplet nucleation (Grant W. Petty) (Site not responding. Last check: 2007-10-12)
		But in reality, the saturation (or equilibrium) vapor pressure for a water surface is a function not only of temperature but also of the curvature of a water surface, owing to the interfacial energy (a.k.a.
		A crude explanation is that the pressure inside the droplet due to surface tension is inversely proportional to the droplet radius; therefore, with decreasing radius, the energetics increasingly favor the escape of water molecules from the droplet and oppose the return of molecules from the vapor phase.
		In the case of a soluble particle, the required vapor pressure for condensation is greatly reduced by the so-called "solute effect", which is also the reason why salt and sugar tend to clump when the air is humid.
	yarchive.net /physics/water_droplet_nucleation.html (481 words)

	Vapor Pressure
		At this point the vapor is said to be saturated, and the pressure of that vapor (usually expressed in mmHg) is called the saturated vapor pressure.
		The temperature at which the vapor pressure is equal to the atmospheric pressure is called the boiling point.
		The boiling point is defined as the temperature at which the saturated vapor pressure of a liquid is equal to the surrounding atmospheric pressure.
	hyperphysics.phy-astr.gsu.edu /hbase/kinetic/vappre.html (610 words)

	Equilibrium Vapor Pressure (Site not responding. Last check: 2007-10-12)
		The equilibrium vapor pressure of a liquid is the pressure exerted by its vapor when it is in equilibrium with the liquid at a given temperature.
		The vapor pressure of a liquid, p (in atmospheres), is related to the temperature at which it is measured, T (in Kelvin), by the Clausius-Clapeyron equation
		In this experiment you will measure the vapor pressure of an unknown liquid at the temperature of a cold water bath (between 0 and 5 degrees Celsius), at room temperature (around 15 to 20 degrees Celsius), and at the temperature of a warm water bath (between 30 and 35 degrees Celsius).
	www.nv.cc.va.us /alexandria/science/EquilibriumVaporPressure.html (930 words)

	Chapter Seven
		The equilibrium vapor pressure of a liquid is dependent upon the particular kind of molecules composing the liquid.
		The effect of increased pressure upon the solubility of a gas in a liquid is illustrated by the behavior of carbonated beverages.
		It should be emphasized that the extent to which the vapor pressure of a solvent is lowered and the boiling point is elevated depends upon the number of solute particles present in a given amount of solvent and not upon the mass or size of the particles.
	www.3rd1000.com /chptr7.htm (3975 words)

	Vapor Pressure (Site not responding. Last check: 2007-10-12)
		The term "vapor" is applied to the gas of any compound that would normally be found as a liquid at room temperature and pressure.
		Over time an equilibrium will be established so that the rate at which molecules evaporate will be equal to the rate at which the gas molecules return to the liquid.
		Now that we understand how vapor pressure works, it is very easy to recognize that vapor pressure should be closely related to intermolecular forces.
	neon.chem.uidaho.edu /~honors/vapress.html (679 words)

	Chapter 3
		This pressure is known as the equilibrium vapor pressure.
		When the vapor pressure is equal to the equilibrium vapor pressure, the air is holding as much water vapor as it can.
		This is because the vapor pressure of H
	ucsu.colorado.edu /~jamisons/class/Chap3/process.htm (1069 words)

	Vapor Pressure above a Liquid (Site not responding. Last check: 2007-10-12)
		For a liquid to vaporize, the kinetic energy of the molecules has to overcome the intermolecular forces.
		The value of the equilibrium vapor pressure depends on the attractive forces between particles of the liquid and on the temperature of the liquid.
		The presence of gases other than vapor above a liquid does not affect the kinetic energy of molecules inside or outside the liquid and does not affect the magnitude of the intermolecular forces in the liquid.
	www.rotronic-usa.com /datasheets/Ref/Phy/liquid.htm (237 words)

	Kotz13
		Ethanol, CH OH, has a vapor pressure of 59 mm Hg at 25 ºC. What quantity of heat energy is required to evaporate 125 mL of the alcohol at 25 ºC? Then enthalpy of vaporization of the alcohol at 25 ºC is 42.43 kJ/mol.
		C), the vapor pressure of hexane is 148 torr.
		Ethyl acetate, a solvent for certain plastics, has a vapor presure of 72.8 torr at 20 °C and a vapor pressure of 186.2 torr at 40 °C. Estimate the value of the enthalpy of vaporization in kilojoules per mole.
	lssu.edu /academics/arts_letters_ss/education/myton/ch116/kotz13.htm (2685 words)

	The MSDS HyperGlossary: Vapor Pressure
		The vapor pressure of a liquid is the pressure exerted by its vapor when the liquid and vapor are in dynamic equilibrium.
		It is important to specify the temperature when stating a vapor pressure because vapor pressures increase with temperature.
		The vapor pressure of mixtures is dealt with using Raoult's Law.
	www.ilpi.com /msds/ref/vaporpressure.html (649 words)

	Thinking It Through 11.9 (Site not responding. Last check: 2007-10-12)
		When a liquid is spread over a large surface area a higher fraction of its molecules are in the surface layer and thus it shows a higher rate of evaporation.
		The equilibrium vapor pressure of a liquid is the vapor pressure at which the rate of evaporation is equal to the rate of condensation.
		The equilibrium vapor pressure remains the same since the increase in rate of evaporation is equal to the increase in rate of condensation.
	wiley.com /college/chem/brady184764/resources/ch11/think_ans11.9.html (250 words)

	CHEM 1312.001 EXAM 1 fri. Feb 12, 1999 (Site not responding. Last check: 2007-10-12)
		Comparing the equilibrium vapor pressure of a hot liquid to the equilibrium vapor pressure of that same liquid when cold, the higher vapor pressure would be exerted by
		Pressures are in units of torr, and temperatures are in units of
		C and a pressure of 760 torr, what would be the first phase transition you would observe if you began heating it at constant pressrue?
	www.accd.edu /pac/chemistr/spring99/c1312001/exam1.htm (1370 words)

	Equilibrium VP (Site not responding. Last check: 2007-10-12)
		At any given temperature, the equilibrium vapor pressure does NOT depend on the amount or the surface area of the liquid present at equilibrium.
		However, as T increases, the fraction of molecules that possess sufficient energy to escape from the liquid increases.
		to increase is for the pressure to increase, equilibrium is re-established with a higher value of P
	www.owlnet.rice.edu /~chem122/lecture/Viewgraphs/G1/lecfig15.html (80 words)

	Forces and Bonding: The Temperature Dependence of Vapor Pressure
		The variation of vapor pressure with temperature is given by the Clausius-Clapeyron equation, (9), where P
		The ideal gas law suggests that gas pressure should increase linearly with temperature, yet vapor pressure increases more rapidly than this.
		Aspirate all traces of liquid and vapor from the interior of the test tube and syringe.
	wpi.edu /Academics/Depts/Chemistry/Courses/General/vaporpressure2.html (841 words)

	esm_brown_chemistry_9\|Intermolecular Forces, Liquids, and Soli\|Problem Solving Center\|eMedia Exercises
		11.107 Using the Equilibrium Vapor Pressure simulation (eChapter 11.5), compare the vapor pressures of methanol, ethanol, acetic acid, water, and benzene.
		If not, give an example of two compounds whose vapor-pressure curves cross, and at what temperature they have roughly the same vapor pressure.
		Based on a comparison of the water molecule and the structure of ice (eChapter 11.8), explain (a) why ice is less dense than water, and (b) why increasing pressure, within a certain temperature range, causes ice to melt.
	wps.prenhall.com /esm_brown_chemistry_9/0,4647,171348-,00.html (454 words)

	GENERAL CHEMISTRY II (Site not responding. Last check: 2007-10-12)
		The equilibrium vapor pressure of a liquid in a closed container depends on
		If a liquid and its vapor are in equilibrium in a closed container, and additional liquid is added to the container,
		Assume both liquid and vapor are still present after the volume increase.
	www.accd.edu /pac/chemistr/spring01/c1312200/q031312200012.html (280 words)

	Vapor Pressure of Liquids (Site not responding. Last check: 2007-10-12)
		When the rate of condensation equals the rate of vaporization of the liquid at a definite temperature.
		When the rate of condensation (returning to liquid) equals the rate of vaporization (breaking away and remaining gas) at a definite temperature this is called the equilibrium vapor pressure.
		Therefore the vapor pressure rises with the rise in temperature.
	www.utmem.edu /physpharm/.002d.html (206 words)

	Body
		at very high pressure freezing point of water is less than 0
		Water Vapor-- (15 torr at room temp; vs. 760 torr)
		a plot of a couple of vapor pressures at a couple of temperatures
	www.bgsu.edu /departments/chem/faculty/endres/ch127/lecture_aug30.htm (592 words)

	Energy Citations Database (ECD) - Energy and Energy-Related Bibliographic Citations (Site not responding. Last check: 2007-10-12)
		Energy Citations Database (ECD) Document #6457696 - Thermodynamic properties of microemulsions: pseudophase equilibrium-vapor pressure measurements
		Availability information may be found in the Availability, Publisher, Research Organization, Resource Relation and/or Author (affiliation information) fields and/or via the "Full-text Availability" link.
		Thermodynamic properties of microemulsions: pseudophase equilibrium-vapor pressure measurements
	www.osti.gov /energycitations/product.biblio.jsp?osti_id=6457696 (136 words)

	Lecture 6 Outline (Site not responding. Last check: 2007-10-12)
		Vapor Pressure is the pressure exerted by water vapor molecules
		2) Equilibrium Vapor Pressure is the vapor pressure that is needed for evaporation and
		2) Since equilibrium vapor pressure is highly dependent on temperature, RH is a lousy
	www.personal.psu.edu /users/c/x/cxh416/meteo3p/lecture6.htm (289 words)

	Find in a Library: High-pressure vapor-liquid equilibrium data for binary and ternary systems formed by supercritical ...
		Find in a Library: High-pressure vapor-liquid equilibrium data for binary and ternary systems formed by supercritical co2, limonene and linalool
		High-pressure vapor-liquid equilibrium data for binary and ternary systems formed by supercritical co2, limonene and linalool
		WorldCat is provided by OCLC Online Computer Library Center, Inc. on behalf of its member libraries.
	worldcatlibraries.org /wcpa/ow/4abb55f393a4c5d9a19afeb4da09e526.html (79 words)

	[No title] (Site not responding. Last check: 2007-10-12)
		Equilibrium Vapor Pressure: Balance between Condensation and Evaporation
		Indication of absolute (as opposed to relative) amount of water vapor
		Dewpoint - temperature to which air must be cooled to reach saturation.
	clem.mscd.edu /~wagnerri/moisture.htm (41 words)

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