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Topic: Molar mass distribution

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	Reference.com/Encyclopedia/Molar mass
		Molar mass is the mass of one mole of a chemical element or chemical compound.
		In physics, molar mass is usually defined in kilograms per mole (kg/mol) because the base SI unit of mass is the kilogram.
		Thus the molar mass of sucrose is its sum: (12.011 * 12) + (1.008 * 22) + (15.999 * 11) = 342.297 g/mol.
	www.reference.com /browse/wiki/Molar_mass (699 words)

	Molar mass distribution - Biocrawler (Site not responding. Last check: 2007-10-15)
		The Molar mass distribution in a polymer describes the relationship between a polymer fraction and the molar mass of that polymer fraction.
		In linear polymers the individual polymer chains rarely have the exact same degree of polymerization and there is always a distribution around an average value.
		The molar mass distribution of a polymer sample depends on factors such as chemical kinetics and work-up procedure.
	www.biocrawler.com /encyclopedia/Molar_mass_distribution (249 words)

	How To Do Molar Mass (Site not responding. Last check: 2007-10-15)
		Phase separation induced fractionation in molar mass in aqueous mixtures of gelatin and dextran Phase separation induced fractionation in molar mass in aqueous mixtures of gelatin and dextran An overview of the effects of phase separation of...
		In chemistry, molar mass is the mass of one mole of substance...
		molar mass: mass in grams of one mole of an element or compound.
	www.1st-in-dental-care.com /OPG/how-to-do-molar-mass.html (534 words)

	Molar mass - Definition, explanation
		Molar mass is the mass of one mole of an element or chemical compound.
		The atomic mass listed for the elements on the periodic table can be interpreted in two ways: first as the mass of a single average atom of the element in unified atomic mass units (u), or secondly as the mass of one mole of the element in grams.
		This second use is the molar mass of the element and is most useful in stoichiometric calculations.
	www.calsky.com /lexikon/en/txt/m/mo/molar_mass.php (211 words)

	tut cofm
		Accordingly, the molar mass estimate "Mf" is based on the best-fit frictional ratio (or other relationships for s and D if a specialized variant of c(s) is used).
		The value in parenthesis is the minimum molar mass of a spherical particle of given density.
		For recalculating the distribution as c(M), we do not need to change any of the parameter settings, because the previous entries of s-min and s-max are already transformed into the corresponding molar mass values.
	www.analyticalultracentrifugation.com /tutorial_cofm.htm (487 words)

	Report Guidelines for Experiment #5
		The final score (in course points) should be calculated by dividing the report point total by 10 and rounding up to the nearest ½ course point.
		Calculate the molar mass of the hydrated salt
		You now have the mass of one mole of the hydrated salt and the mass of the water in one mole of the hydrated salt.
	www.wsu.edu /~genchem/chem101/notes/exp05rep.htm (221 words)

	Virtual Chemistry Experiments and Exercises (Site not responding. Last check: 2007-10-15)
		A radial distribution plot, an electron density plot, and a virtual reality isosurface plot for the hydrogen 1s orbital are displayed to illustrate the significance and use of each type of orbital representation.
		The molar enthalpy of methane is determined and used to determine the standard molar enthalpy of formation of methane.
		A plot of absorbance vs concentration is prepared, and the molar absorptivity is determined from the slope of the plot.
	www.chm.davidson.edu /ChemistryApplets (3839 words)

	Articles - Polymer (Site not responding. Last check: 2007-10-15)
		Because synthetic polymer formation is governed by random assembly from the constituent monomers, polymer chains within a solution or substance are generally not of equal length.
		An ensemble of differing chain lengths, often obeying a normal (Gaussian) distribution, occurs because polymer chains terminate during polymerization after random amounts of chain lengthening (propagation).
		This is because a polymer actually consists of a statistical distribution of chains of varying lengths, and each chain consists of monomer residues which affect its properties.
	www.sinoz.com /articles/Polymer (1512 words)

	Fuel cell membrane electrode assemblies with improved power outputs and poison resistance - Patent 6300000
		The Porometer determines the pore size distribution of a sample by increasing air pressure on the sample and measuring the resulting flow.
		This distribution is a measure of the degree of uniformity of the membrane (i.e., a narrow distribution means there is little difference between the smallest and largest pore size).
		The mass activity is the amount of current generated (or alternatively power generated) per unit mass of catalyst metal in the active area.
	www.freepatentsonline.com /6300000.html (18717 words)

	International Union of Pure and Applied Chemistry
		In spite of the ample use of Size Exclusion Chromatography (SEC) for measuring the molar mass distribution (MMD) of polymers, there are huge variations in the results obtained by different laboratories, when analyzing the same polymer sample.
		Due to BB, the polydispersity is overestimated when calculated from a mass signal and a calibration curve, but is generally underestimated when obtained from the combined mass and "molar mass" signals.
		Many approximate solutions have been proposed to overcome the classical deconvolution approach, e.g.: a) to assume simple analytical functions for the kernel and the mass chromatogram; b) to propose semi-empirical corrections based on the chromatogram shapes; and c) to modify the molar mass calibration rather than correcting the raw chromatograms.
	www.iupac.org /projects/2003/2003-023-2-400.html (700 words)

	TAPPI Website - On the Dissolved Organic Material in the Closed-Cycle Bleaching: Molar Mass Distributions in the TCF ... (Site not responding. Last check: 2007-10-15)
		The filtrates were analysed for COD and relative molar mass distributions of the dissolved organic material.
		It was found that the molar mass distributions of the dissolved organic material varied greatly depending on their origin.
		The ozone stage filtrates had significantly lower relative molar mass distribution than the hydrogen peroxide stage filtrates.
	www.tappi.org /s_tappi/doc_bookstore.asp?CID=5120&DID=525048&css=print&css=print&css=print (409 words)

	Postnova Analytics- Light scattering
		Static Light Scattering is used for the determination of Molar Mass, Radius of Gyration and the Second Virial coefficient (A2).
		Batch Mode analysis is easy to perform, but in case of crude complex sample mixtures with a broad and or multi-modal distribution, this approach has significant limitations, as it is difficult to calculate the correct molar mass and particle size distribution with light scattering only.
		Mass Spectroscopy has become very famous in the last decade, but this technique also requires a big investment and does not reach the same upper molar mass range as light scattering does.
	www.light-scattering.com (603 words)

	Polymer Chemistry
		On the basis of a long lasting experience model polymers of different kind can be prepared ranging from linear homopolymers to branched block copolymers of well defined molar mass and molar mass distribution, composition and architecture.
		The other two labs are utilized for the characterization of the produced polymers.
		The first laboratory is equipped with instruments basically used for the determination of the molar mass characteristics, while the second laboratory contains instruments which are used for the determination of other physical properties, e.g.
	www.fz-juelich.de /iff/e_ins_polymerchemistry (170 words)

	Cryoelectron Microscopy and EPR Analysis of Engineered Symmetric and Polydisperse Hsp16.5 Assemblies Reveals ...
		b, molar mass distribution and UV absorption profiles of WT Hsp16.5 (orange), Hsp16.5-TR (blue), Hsp16.5-P1 (green), and Hsp16.5-P1N (magenta).
		The lines across the UV absorbance peaks are calculated molar mass values obtained as a function of elution volume.
		a mass distribution reminiscent of that of mammalian sHSP.
	www.jbc.org /cgi/content/full/281/52/40420 (5311 words)

	Postnova - The Asymmetric Flow Field-Flow Fractionation
		Unlike High Temperature GPC (Gel Permeation Chromatography), no size exclusion limit is restricting the upper molar mass of the separated polymers.
		The data proves that the bimodal distribution shown in the GPC results is only caused by the size exclusion limit of the column.
		Only by using High Temperature Asymmetric Flow Field-Flow Fractionation the “real” distribution of this sample can be discovered, including the high molar mass fractions, which are missing in the High Temperature GPC data.
	www.field-flow-fractionation.com /asymetric-flow.htm (739 words)

	Universal scaling for polymer chain scission in turbulence -- Vanapalli et al. 103 (45): 16660 -- Proceedings of the ...
		the molar mass distribution reaches a steady state (13).
		) corresponding to the steady-state molar mass distribution
		is half of the reported initial (undegraded) molar mass.
	www.pnas.org /cgi/content/full/103/45/16660 (3515 words)

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