Molar ratio, definition

Although this equation reduces to an identity whenever solute-solvent interactions are embodied in the definition of the Henry s law standard state (cf section 10.2), it must be noted that K[ is the molar ratio of trace element i in the two phases and not the weight concentration ratio usually adopted in trace element geochemistry. As we will see later in this section, this double conversion (from activity ratio to molar ratio, and from molar ratio to weight concentration ratio) complicates the interpretation of natural evidence in some cases. To avoid ambiguity, we define here as conventional partition coefficients (with the same symbol K ) all mass concentration ratios, to distinguish them from molar ratios and equilibrium constants. 

Figure 10 is a ternary diagram for the systems Triolein/S/ Methanol, where S is respectively 4/1 molar ratios of 2-octanol to bis(2-ethylhexyl) sodium sulfosuccinate, triethylammonium linoleate or tetradecyldimethyl ammonium linoleate at 25°C. Not much difference is noted between phase areas for the triethylammonium linoleate and bis(2-ethylhexyl) sodium sulfosuccinate systems. Both are definitely inferior to the tetradecyldimethylammonium linoleate which shows the greatest solubilized area of methanol in triolein at 25°C. 

A / -D-glucan has been isolated from the cell walls of 3-day-old, mung-bean hypocotyls.76 Extracts of cell walls of older hypocotyls were deficient in this polysaccharide. The glucan contained 3-linked and 4-linked glucopyranosyl residues in the molar ratio of 1.0 1.7. However, the hypocotyl tissue from which the glucan was extracted contained both primary and secondary walls, and therefore, the polymer cannot be definitely characterized as a primary cell-wall component. 

More than 30 years ago, Scott, Obenhaus, and Wilson (135) suggested that for lithium chloride, a solute to solvent ratio of 1 10 corresponded to a definite composition, and they quoted earlier measurements (134) as indicating two distinct, definite values for the magnetic susceptibility of lithium chloride above and below the concentration, corresponding to a decahydrate in solution. Likewise, anomalies were also found in the density of such solutions. Scott, Obenhaus, and Wilson also quoted Hiittig and Keller (83) who found that the densities, refractive indices, and coefficient of extinction of lithium halide solutions showed discontinuous changes with concentration for molar ratios of water to solute of 6, 30, and 75. 

Since by definition m+x = 0, kx must equal zero and iy reduces to my/m+y Both relationships are linear and a direct proportionality exists between molar ratios and measured ion intensities. 

Without the results from our second study, a definitive conclusicai is not easy. If results of our 1st study are applicable to a range of dietary zinc intakes, a phytate to zinc molar ratio of 10 to 12 is not a hinderance to bioutilization of zinc by humans and the level of intake of zinc becomes a limiting factor in determining adequacy. We know from our analysis of self-chosen diets, and estimation by others, that most people consume diets that are less than 10 in phytate/zinc molar ratio. Vegetarians, particularly those who eat a lot of cereal products, will very likely exceed the value of 10. There is wide variation between individuals and from day to day by each individual. The role of adaptation or response of homestatic control mechanisms require further clarification but it is our feeling at present that humans can consume a wider molar ratio of phytate to zinc than heretofore thought. 

The RjZn compounds react with acidic hydrocarbons to split the original Zn— C bonds and form new ones. The rate depends on hydrocarbon acidity e.g., reactions with triphenylmethane proceed slowly and incompletely. Therefore, it is nearly impossible to obtain organozincs with stoichiometric compositions. More definite results are obtained with 1-alkynes, in which, depending on the molar ratio, one or two organic groups at Zn can be substituted for alkynyl groups ... 

Thus after breaches about 0.5 the molar ratio CC04 Ct is approximately unity and the rate of reaction becomes dependent on the slow decomposition of the hypochlorite. While the occurrence of melting during these reactions cannot be definitely excluded, it is thought to be improbable. 

In a balanced equation, the number of moles of one substance is stoichiometrically equivalent to the number of moles of any other substance. The term stoichiometrically equivalent means that a definite amount of one substance is formed from, produces, or reacts with a definite amount of the other. These quantitative relationships are expressed as stoichiometrically equivalent molar ratios that we use as conversion factors to calculate these amounts. Table 3.3 presents the quantitative information contained in the equation for the combustion of propane, a hydrocarbon fuel used in cooking and water heating ... 

DSC, reported that SCN, another chaotropic anion, stabilizes BSA in the same conditions. It is known that SCN binds strongly to BSA [191]. We observed [195] that Ca2+ and Mg2+ decrease QD and Tm of ribulose 1,5-diphosphate carboxylase (Rubisco) to a limited extent but in a definite and steady way as their concentration increases over the ionic strength range 0-0.3 mol/L Na+ and NH+4 had an opposite effect. In the case of Rubisco, specificity of the effect of Ca2+ and Mg2 + is supported by the fact that these cations are known to bind to the protein and to affect its enzymatic activity by inducing structural changes. Specific effects of Na+ and Ca2+ are also observed by DSC on the heat stability of a-lactalbumin [190] they result in a linear increase of QD with the cation/protein molar ratio up to 1, followed by a plateau (Fig. 7). 

Very little is known about the structure of the cured polyester resin. The products definitely belong in the thermoset class. There is some correlation between maximum physical properties a nd a molar ratio of 1 1 between double bonds in the alkyd and monomer. However, this is not critical and simple cross-linking does not tell the full story. The styrene monomer can be present in twice the molar amount needed, and yet complete copolymerization takes place without apparent formation of styrene polymer. 

All the experiments were conducted with the same amount of active metal (0.54 mg Pd) at 40 °C and at a H2-partial pressure of SOOmmHg. The molar ratio of Pd to the substrate was 1 2070. It was shown that catalysts, the functional groups of which decreased the retention time of the substrate in the polymer matrix or enhanced the substrate solubility in the polymer matrix, catalyzed the hydrogenation of styrene more effectively. Such catalyst types included Jt-acceptor or hydrophobic supports. During the hydrogenation of allyl acrylate of the polar substrate model, the catalytic activity depended on both the -acceptor and polar properties of the polymeric supports. Thus, a definite relationship was determined between properties of functional groups and the respective polymers. 

Synonyms Benzene, ethenylmethyl-, polymer with (1 -methylethenyl) benzene oc-Methylstyrene-vinyltoluene copolymer Definition Polymer of methylstyrene and vinyltoluene monomers (molar ratio 1 oc-methylstyrene to 3 vinyltoluene)... 

Definition Compd. of magnesium oxide and silicon dioxide with molar ratio approx. 2 5 Empirical MgO Si02 XH2O Properties Wh. fine effervescent powd., odorless, tasteless insol. in water, alcohol decomp, by acids pH 7-10.8 (10% aq. susp.)... 

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