Weight molarity

The Debye temperature, can be calculated from the elastic properties of the solid. Required are the molecular weight, molar volume, compressibility, and Poisson s ratio.11 More commonly, do is obtained from a fit of experimental heat capacity results to the Debye equation as shown above. Representative values for 9o are as follows ... 

The sedimentation coefficient s°, or its normalized form 5 0 w function of the conformation and flexibility of a macromolecule (via its translational frictional property) and its mass. So if we are going to obtain conformation and flexibility information we need to know the molecular weight (molar mass)... 

When specifying a composition as a percentage it is important to state clearly the basis weight, molar or volume. 

Study object Small molecular weight (molar mass) organic compounds,... 

Historically, the target analytes in clinical mass spectrometric applications were small, volatile compounds that could be analyzed by GC-MS (see Chapter 4). With time, new chemical preparation techniques and derivatization schemes broadened the scope of these metabolites to include fatty acids, amino acids, intermediates of glucose oxidation, phospholipids, steroids, neurogenic amines, nucleic acids, etc. The molecular weights (molar masses) after derivatization were less than 1000 Da, a mass range easily within the limits of most conventional mass spectrometers. 

One problem with GC-MS, in addition to being labor intensive and having particularly long analysis times, was that higher molecular weight (molar mass) components or compounds with preformed cations (such as cholines or carnitine) are easily hydrolyzed and cannot be analyzed effectively using GC-MS. With the advent of new ionization techniques for LC effluents (see Section 4.1.2), such as electrospray ionization (see Section 2.1.15), more volatile and larger molecular mass compounds could be analyzed,... 

Product yields Volume Weight Molar Miscellaneous ... 

Numerous difficulties can arise when calculating yields in solid-phase syntheses.13 Errors in resin weight, molar concentration of products on the resin, and elemental analysis can be relatively large. Three distinct cases were identified, and these required different methods of yield determination... 

The size parameter in such correlations can come from molecular weights, molar volumes, or other related parameters. One such parameter is the estimate of compound size based on the incremental contributions of the atoms involved. Such an approach is the basis for methods like those of McGowan (see Box 5.1 below). 

The molar heat capacity is the product of specific heat and mole weight Molar heat capacity = 151 159 6 [T) g... 

Compound Formula Molecular Weight Specific Gravity % by Weight Molarity (M)... 

Quinones et al. (2000) reported the successful use of neural networks to predict the half-life of a series of 30 antihistamines. The input for the network was derived from the output of CODES, a routine that generates descriptors for a structure based on atom nature, bonding, and connectivity. Attempts to correlate the half-life with the physicochemical parameters log Kow, pKa, molecular weight, molar refractivity, molar volume, parachor, and polarity were unsuccessful. In a subsequent study by Quinones-Torrelo et al. (2001), the authors correlated the half-life of 18 antihistamines with their retention in a biopartitioning micellar chromatography system with a resultant correlation coefficient (R2adj) value of 0.89. The correlation is explained in that the retention in this system is dependent on hydrophobic, electronic, and steric properties, which are also important in determining half-life. 

Molar mass ( molecular weight ), molarity, radiant excitance (emitted radiant flux)... 

The ionic liquids are dense systems, with the density exhibiting well-defined temperature dependencies. Table 5.2 shows the density of the ionic liquids in a range of temperatures. The density decreases linearly with the temperature increase, regardless of the ionic liquid strucmres. Based on the density data and the molecular weight, molar concentration of each ionic liquid has also been calculated and listed in Table 5.2. Molar concentrations of the ionic liquids are high, and they change with structures and temperature. 

The molar volume of a pure substance can be obtained from density measurements, i.e., p = (molecular weight)/(molar volume). The volume contributed to a solution by the addition of 1 mole of an ion is, however, more difficult to determine. In fact, it has to be measured indirectly. This is because, upon entry into a solvent, the... 

Sometimes the weight-molarity is called molality. A few authors have used molality as the moles per liter of solution, but this usage has not been accepted. 

The density of constant-boiling hydrochloric acid is l.ljO g/ml. It contains 20.24% HCl. Calculate the weight molarity, the volume molarity, and the mole fraction of HCl in the solution. 

Even without the use of a UC curve (one must be generated for each series of measurements), measurement of [t7o] is believed by some to yield an intrinsic viscosity-weighted molar mass [2]. Most importantly, there is a historic interest in the relation of [t ] to molar mass and/or size. Indeed, the study and explanation of UC has occupied the theorists for some time and, accordingly, there are various formulations describing such relationships [2]. For linear polymers, the most popular empirical relationship between [77] and molar mass is the Mark-Houwink-Sakurada (MHS) equation... 

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