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Topic: Mole fraction

 Mole Fraction Problems Mole Fraction concentration is defined as the moles of one component divided by Total Moles of Components in solution. mole fraction = 0.2 = moles of Sucrose / mols Sucrose + mols water Determine the mole fraction concentration of Glucose in a solution in which 320 grams of glucose C members.aol.com /profchm/molefrac.html   (567 words)

 Unit Operations in Food Processing - R. L. Earle The mole fraction of a component in a mixture is the proportion of the number of molecules of the component present to the total number of the molecules of all the components. The partial pressures and the mole fractions are proportional, so that the total pressure is made up from the sum of all the partial pressures, which are in the ratios of the mole fractions of the components. mole fraction of nitrogen = 79 / [79 + 21] www.nzifst.org.nz /unitoperations/conteqseparation2.htm   (796 words)

 Mole fraction - Wikipedia, the free encyclopedia In chemistry, the mole fraction of a component in a mixture is the relative proportion of molecules belonging to the component to those in the mixture, by number of molecules. By definition, the sum of the mole fractions equals one, a normalization property. Mole fractions are one way of representing the concentrations of the various chemical species. en.wikipedia.org /wiki/Mole_fraction   (325 words)

 Warts Mole ~ Mole Fraction   (Site not responding. Last check: 2007-09-03) Mole Fraction of Water Vapor in Moist Air - The mole fraction of water vapor express the ratio of water molecules to air and water molecules. The mole fraction of a component in a mixture is the proportion of the... The air's potential to absorb water is proportional to the difference between the mole fraction, m a, of water vapour in the ambient air and the mole fraction, m w, of water vapour in the saturated... www.wartsmole.com /molefraction   (1229 words)

 Project Links | Mass Transport Quantity can be expressed in terms of weight (mass), volume or moles, and concentration in terms of mass fraction, volume fraction, mole fraction; mass per volume, moles per volume, moles per mass, and equivalent charge per volume. Mole fraction, the most rigorous thermodynamic concentration unit, expresses the number of moles of the substance of interest per total system moles. Moles per volume expresses the number of moles of substance i present in a volume of phase j. links.math.rpi.edu /devmodules/masstransport/html/concunit_theory.html   (1557 words)

 Concentration of Solutions The mole fraction is the number of moles of one component of a mixture divided by the total number of moles in the mixture. Raoult’s Law is an example of an application that requires mole fraction concentrations: the vapor pressure of a liquid in a mixture depends on the mole fraction of that liquid. The purpose of formality is to distinguish the number of moles of a compound from the number of moles of ions in solutions of ionic compounds or weak electrolytes. www.chemprofessor.com /conc.htm   (2352 words)

 Mole Fractions   (Site not responding. Last check: 2007-09-03) The mole fraction of a component in a solution is simply the number of moles of that component divided by the total moles of all the components. moles of component C, etc., then the mole fraction of component A is given by The sum of the mole fractions of all components is equal to one. www.tannerm.com /molefract.htm   (65 words)

 General Chemistry Online: Glossary: The heat required to raise the temperature of one mole of a substance by 1°C is called the molar heat capacity of the substance. The mole is the SI unit for amount of substance. 1 mole of particles is equal to the number of atoms in exactly 12 g of carbon-12. antoine.frostburg.edu /chem/senese/101/glossary/m.shtml   (1485 words)

 Environmental Protection Agency > Basic Concepts in Environmental Sciences > Module 2 Concentrations expressed in volume percent, mole fraction, and ppm are volumetric ratios (i.e. The mole fraction of phenol vapor in a gas stream is 0.00001. The sum of all of the mole fractions of the compounds present in the gas mixture must equal 1.0. www.epa.gov /eogapti1/module2/concentrate/pp_answer/p_answer.htm   (328 words)

 Distillation   (Site not responding. Last check: 2007-09-03) The table shows that at the 84.3 C boiling temperature of this mixture, the hexane vapor above the 0.5 mole fraction hexane liquid is exerting 0.77 atm of the total 1 atm pressure. Since PV=nRT says pressure is proportional to moles, the mole fraction of hexane in the vapor is 0.77, which is larger than the 0.5 mole fraction hexane in the liquid. The actual fraction of terpene molecules in the distillate depends on the surface area of the plant material as well as the vapor pressure of the terpene. www.pittstate.edu /chem/courses/chem326/distillation_fund.html   (878 words)

 Links/Connections Since the mole is the central concept in quantitative chemistry, it is related to almost all topics supported in high school chemistry. The molar heat of fusion (thermal energy required to melt one mole of substance), the molar heat of vaporization (thermal energy required to evaporate one mole of substance), and the molar heat capacity (thermal energy required to raise the temperature of one mole of substance by one degree) are all commonly used quantities. Since the mole is central to chemistry, related areas such as medicine, biochemistry, biology, geology, physics, agronomy, and environmental science use the mole concept with reference to chemical processes important in those disciplines. intro.chem.okstate.edu /ChemSource/Moles/mole21.htm   (1116 words)

 MIJ-NSR Volume 3, Article 10 The determination of this mole fraction can be done with relative intensities of the analytical signals MCs+ of matrix cations, as has been shown by Gnaser [3] [4] who used molecular secondary ions to determine relative sensitivity factors (RSF) in the AlGaAs/GaAs system. The calculation of the InN mole fraction in samples P1 and P2 was done using the standardless variant of the fundamental parameters method. The InN mole fraction was determined by the intensity ratio of the standard samples versus P1 and P2. nsr.mij.mrs.org /3/10/complete.html   (1382 words)

 Polyethylenes containing a unique distribution of short chain branching - Patent 6153716 The fractionation column employed in the fractionations consisted of, from outside in, a thin metal shell, several layers of insulation material, and a jacketed stainless steel inner column packed with glass beads of mesh sizes from 60 to 80. This polymer was subjected to Solvent Gradient Fractionation in the same manner employed on the polymer of Example V. The results of the analysis of ethyl branch distribution for the various fractions and their relation to MWD for this polymer are presented in FIGS. The mole percent of ethyl branches, reported in the Figure as the apparent mole percent of butene, was similar for both polymers. www.freepatentsonline.com /6153716.html   (9209 words)

 Example 10.--Aragonite-Strontianite Solid Solution --(A) Mole fraction of strontianite and aragonite in solid solution, (B) mole fraction of calcium and strontium in aqueous phase, (C) moles of strontianite and aragonite in solid solution, and (D) moles of miscibility-gap end members in solid solution, as a function of the amount of strontium carbonate added. For compositions that fall within the miscibility gap, the activities of calcium and strontium within the aqueous phase remain fixed and are in equilibrium with solids of two compositions, one solid with a strontium mole fraction of 0.0048 and one solid with a strontium mole fraction of 0.8579. Addition of more strontium carbonate increases the mole fractions of strontium in the aqueous phase and in the solid solution until both mole fractions are nearly 1.0 after the addition of 10 mol of strontium carbonate. wwwbrr.cr.usgs.gov /projects/GWC_coupled/phreeqc/html/final-79.html   (745 words)

 VLE_home Similarly, the mole fraction of blue molecules in the liquid phase is given by x = 8/20 = 0.4. Note that when we change the mole fraction of the feed, that the fraction vaporized, or the relative amounts of vapor and liquid are what change because the compositions are fixed by the equilibrium relationships. The first one shows that the fraction vaporized can be represented in terms of the feed mole fraction and the equilibrium y and x values. www.et.byu.edu:8080 /~rowley/VLEfinal/background3.htm   (800 words)

 Semiconductor light-emitting diode - Patent 6984850 However, when the In mole fraction of the AlGaInP layer (to be employed as the current diffusion layer) is decreased, the lattice constant thereof is varied, whereby the AlGaInP current diffusion layer becomes lattice-mismatched with the underlying light-emitting structure. P current diffusion layer 106 in Embodiment 2, the In and Al mole fractions are gradually varied from the lower portion (i.e., from the interface with the light-emitting structure 11) toward the upper portion (i.e., toward the top surface thereof). P is mainly influenced by an In mole fraction 1-y, not by an Al mole fraction x (or a Ga mole fraction complementary to Al mole fraction x). www.freepatentsonline.com /6984850.html   (6971 words)

 Molality - Given Mole Fraction   (Site not responding. Last check: 2007-09-03) The Mole Fraction (X) of a component in a solution is the number of moles of that component divided by the total number of moles making up the solution (including the solvent). Molality (m), or molal concentration, is a measure of moles of a solute dissolved in a mass of solvent. Specifically, it is the number of moles (n) of solute dissolved in 1 kg of solvent. lrc-srvr.mps.ohio-state.edu /under/chemed/qbank/9/9-13/index.htm   (198 words)

 Vapor Pressure of a Mixture: Raoult's Law Here, for decane, we multiply the mole fraction, which is.6, by the vapor pressure, which is 5. For diethyl ether, we multiply the mole fraction, which is.4, by the vapor pressure, which is 460. This solution, which has a higher mole fraction of ether than the previous one, has a higher vapor pressure. jchemed.chem.wisc.edu /JCESoft/CCA/CCA2/MAIN/VAPORES6/CD2R1.HTM   (428 words)

 General Chemistry Online: Companion Notes: The mole Explain the mole concept, and convert between grams, moles, and atoms and molecules. The official definition is "1 mole of particles is equal to the number of atoms in exactly 12g of carbon-12". Convert moles of A to moles of B using mole ratios from the balanced chemical equation. antoine.frostburg.edu /chem/senese/101/moles/index.shtml   (1110 words)

 equilibrium constants - Kp If you have a mixture of gases (A, B, C, etc), then the mole fraction of gas A is worked out by dividing the number of moles of A by the total number of moles of gas. For example, in a mixture of 1 mole of nitrogen and 3 moles of hydrogen, there are a total of 4 moles of gas. The mole fraction of nitrogen is 1/4 (0.25) and of hydrogen is 3/4 (0.75). www.chemguide.co.uk /physical/equilibria/kp.html   (829 words)

 Liquid-Vapor Equilibrium A series of binary mixtures (having varying mole fractions) are boiled and the compositions (mole fractions) of the distillates and the remaining binary mixtures are determined. For an ideal mixture, a plot of total vapor pressure vs. mole fraction of one component is predicted to be a straight-line plot. Use your calibration curve to calculate the mole fractions of A and B in the distillate, and in the residue. www.msstate.edu /dept/Chemistry/scf2/4411/twocomp.htm   (900 words)

 Mole fraction   (Site not responding. Last check: 2007-09-03) total components, then the mole fraction of the th component is the number of moles of this component, , in the solution divided by the total number of moles present: www.nyu.edu /classes/tuckerman/honors.chem/lectures/lecture_12/node3.html   (30 words)

 Environmental Protection Agency > Basic Concepts in Environmental Sciences > Module 2 Calculate the concentrations of gaseous pollutants in units of percent by volume, mole fraction, parts per million, milligrams per cubic meter, micrograms per cubic meter, and nanograms per cubic meter. The mole fraction is simply an expression of the number of moles of a compound divided by the total number of moles of all the compounds present in the gas. Concentration data expressed as mole fractions have the same value at both actual and standard conditions, because any changes in the temperature and pressure would equally affect the numerator and denominator of Equation 8. www.epa.gov /eogapti1/module2/concentrate/concentrate.htm   (2523 words)

 Solutions   (Site not responding. Last check: 2007-09-03) It should be obvious that any mole fraction will be less than 1 and the sum of the mole fractions for all components is equal to 1. Since mole fraction is moles divided by moles, it has no units. Mole fraction can be used for any mixture of components. home.att.net /~v.d.singleton/genchem/solution.htm   (5919 words)

 Determination of the Stoichiometry of a Complex Using Spectrometric Measurements Since the sum of the mole fraction of M and the mole fraction of L must be equal to 1, the mole fraction of L =  0.67. In the mole ration method, varying amounts of ligand are added to a constant amount of metal ion. Plot absorbance versus the ratio of the moles of phenanthroline to the moles of iron. tonga.usip.edu /bentzley/expt5complex.htm   (1054 words)

 Chemical Terms Dictionary - Definition of Term Mole Fraction Chemical Terms Dictionary - Definition of Term Mole Fraction Definition : Literally, the fraction of the total number of moles in a mixture due to one component of the mixture. The mole fraction of a solute, for example, is the number of moles of solute divided by the total number of moles of solute plus solvent. www.alcwin.org /Chemical_Terms_Description-393-M.htm   (435 words)

 Concentrations of Solutions The mole fraction, X, of a component in a solution is the ratio of the number of moles of that component to the total number of moles of all components in the solution. The number of moles of each component present in the solution. The mole fraction of A, in a solution consisting of A, B, C,... www.chem.purdue.edu /gchelp/howtosolveit/Solutions/concentrations.html   (300 words)

 dalton's Law Problems (2) Volume IS the same as mole fraction, because all of the gases are at the same temperature and pressure. So the mole fraction of oxygen is equal to the "pressure fraction", or 156 mm Hg / 743 mm Hg = 0.210 Volumes are proportional to moles so you can use the volumes like we used the mole fractions in problem #4. homepage.mac.com /sklemmer/Honors/daltonwkt.htm   (575 words)

 MODULE8 Ratio of the moles of one constituent (e.g. Mole Percent is obtained by multiplying mole fraction by 100. , the mole fraction of water and the mole percent of water and the mole percent of the two constituents, and (d) the percent by weight of FeSO webusers.xula.edu /tmandal/pharmaceutics/module8.html   (314 words)

 Chemistry : Chapter 9 : Vapor Pressure of Solutions   (Site not responding. Last check: 2007-09-03) Remember that the mole fraction does not have units. If you do get a very low value for vapor pressure of a solution, check that you have not calculated the mole fraction of solute instead of the mole fraction of solvent. If the solute is an ionic compound in water, you must use the moles of ions rather than the moles of compound as the moles of solute in the calculation of mole fraction. www.wwnorton.com /chemistry/concepts/chapter9/ch9_3.htm   (442 words)

 Volume fraction - Wikipedia, the free encyclopedia This is why mole fractions are a safer unit to use. As with mole fractions, the dimensionless volume fractions sum to one by virtue of their definition. Thermodynamic functions using volume fractions reduce to mole-fraction expressions for mixtures of rigid molecules of roughly equal size. en.wikipedia.org /wiki/Volume_fraction   (261 words)

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