Formulae four-volume

A, K 1267 A. Since AsF has an effective volume of 105 A and the effective packing volume of CioFg in its crystal is 226 A, the anticipated formula unit volume for the 1 1 salt is 330 A. The observed unit cell volume is therefore consistent wiih four formula units. Moreover, the dimensiems of the unit cell indicate that the species... 

It is much more convenient to use the collective volumes where the earlier annual volumes of Organic Syntheses are combined in groups of 9 or 10 in the first six collective volumes (Volumes 1-6), and then in groups of 5 for the next four volumes (Volumes 7,8,9, and 10). Useful indices are included at the end of each of the collective volumes that classify methods according to the type of reaction, type of compound prepared, formula of compound prepared, preparation or purification of solvents and reagents, and use of various types of specialized apparatus. 

A gaseous organic compound containing only carhon, hydrogen, and nitrogen is burned in oxygen gas, and the volume of each reactant and product is measured under the same conditions of temperature and pressure. Reaction of four volumes of the compound produces four volumes of CO2, two volumes of N2, and ten volumes of water vapor, (a) How many volumes of O2 were required (b) What is the empirical formula of the compound ... 

Readers should note that this kind of inconsistency is distinct from the "atomic weights" versus "equivalents" problem discussed eariier. For exampie, the two-voiume formuia for marsh gas (methane) was CH4 in atomic weights but CjH, in equivaients the respective four-volume formulas were CjHj and CiHj. For details on this probiem, see CA. 

The volumes of heads must be calculated separately and added to the volume of the cylindrical portion of the tank. The four types of heads most frequently used are the standard dished head, torispherical or ASME head, ellipsoidal head, and hemispherical head. Dimensions and volumes for all four of these types are given in Luken.s Spun Heads, Lnkens Inc., Coatesville, Pennsylvania. Approximate volumes can also be calculated by the formulas in Table 10-65. Consistent units must be used in these formulas. 

In summary, the intensity of the analytical line of any of the elements present in the excited volume to the sample is determined by four groups of data. The first ( Sample ) is only dependent on the sample as a whole (density, local thickness), so being common for all elements in the excited volume. The second ( FactovAf) only depends on atomic data, the third is the fraction of the given element (ca) and the fourth is the detection efficiency at the energy of the detected line. (Mass fractions appear in these formulas, as explained in the Appendix.)... 

The variance of the instrumental spreading function, i.e. the spreading factor of monodispersed polymer in a SEC column was determined experimentally with narrow MWD polystyrene standard samples by the method of simultaneous calibration. The dependence of the spreading factor on the retention volume deduced from a simple theoretical approach may be expressed by a formula with four physically meaningful and experimentally determinable parameters. The formula fits the experimental data quite well and the conditions for the appearance of a maximum spreading factor are explicable. 

Volume 15 of this series features four important reviews of research on alkaloids. Chapter 1 by B. S. Joshi, S. W. Pelletier and S. K. Srivastava is the first comprehensive review of the carbon-13 and proton NMR shift assignments and physical constants of diterpene alkaloids and their derivatives. In addition to the catalogue of spectral and physical data, the chapter includes a table of the occurrences of these alkaloids in various plant species, tables containing molecular formulas versus calculated high-resolution mass values, and calculated high-resolution mass values versus the molecular formulas of diterpenoid alkaloids, as well as seven tables summarizing the carbon-13 chemical shifts of various functional groups in diterpenoid alkaloids. 

---