Formulae Hill order

Chemical formula Hill ordered summary (see the discussion of protonation below for examples of unexpected results). 

Volumes 1-13 of Chemical Abstracts had no Formula Index. Formula Indexes, listing formulae in the Hill order, were produced annually from Volume 14 (1920), and there is a Collective Formula Index that covers Volumes 14-40 (1920-1946). 

The Hill empirical formula is obtained for a particular compound by placing the elements in their alphabetical order unless C is present, in which case C is placed first, H second, and the remaining elements in alphabetical order. Substances with the same Hill formula are ordered alphabetically by their name. However, tables representing different states of the same species are in the order crystal, liquid, crystal-liquid, and ideal gas. 

Molecular Formula Index Lists compounds by molecular formula in the Hill Order (see Preface to this Handbook). 

This table gives the sublimation (vapor) pressure of some representative solids as a function of temperature. Entries include simple inorganic and organic substances in their solid phase below room temperature, as well as polycyclic organic compounds which show measurable sublimation pressure only at elevated temperatures. Substances are listed by molecular formula in the Hill order. Values marked by represent the solid-liquid-gas triple point. Note that some pressure values are in pascals (Pa) and others are in kUopascals (kPa). For conversion, 1 kPa = 7.506 mmHg =... 

Substances are listed by molecular formula in the Hill order. More precise data on the variation of density with temperature over a wide temperature range can be found in Reference 1. 

The absolute viscosity of some common liquids at temperatures between -25 and 100°C is given in this table. Values were derived by fitting experimental data to suitable expressions for the temperature dependence. The substances are arranged by molecular formula in the modified Hill order (see Preface). All values are given in units of millipascal seconds (mPa s) this unit is identical to centipoise (cp). 

Substances are arranged by molecular formula in Hill order, except that compounds not containing carbon precede those that do contain carbon. 

In Tables 1 and 2, values are given for 17 for a selection of asymmetric and symmetric tops, respectively. In cases where the higher order parameters have been determined, these are given in the Comments column. Where appropriate, this column also indicates the specific top, isomer, state, and/or isotopomer that has been studied. For ethane, three symmetric top isotopomer are listed to illustrate the isotopic dependence of 17 and 17. In aU other cases, only one isotopomer is listed, even if several have been studied. In aU but one of these cases, the isotopomer reported is the one with the highest natural abundance. However, CH OCDO is listed because the results obtained are more precise than for CH OCHO. The molecules are listed alphabetically in Hill order according to the molecular formula. 

A number of molecules have been detected in the interstellar medium, in circumstellar envelopes around evolved stars, and comae and tails of comets through observation of their microwave, infrared, or optical spectra. The following list gives the molecules and the particular isotopic species that have been reported so far. Molecules are listed by molecular formula in the Hill order. All species not footnoted otherwise are observed in interstellar clouds, while some are also found in comets and circumstellar clouds. The list was last updated in October 2008 and lists 162 molecules (298 isotopic forms). 

Compounds are listed by molecular formula in Hill order. 

This table gives the standard state chemical thermodynamic properties of about 2500 individual substances in the crystalline, liquid, and gaseous states. Substances are listed by molecular formula in a modified Hill order all substances not containing carbon appear first, followed by those that contain carbon. The properties tabulated are ... 

Many of the critical constants in this table are taken from reviews produced by the lUPAC Commission on Thermodynamics (References 1- 8). Compounds are listed by molecular formula in modified Hill order, with compounds not containing carbon preceding those that do contain carbon. The assistance of Douglas Ambrose is gratefully acknowledged. 

This table gives vapor pressures of 67 important fluids in the temperature range 2 to300 K. Helium ( He), hydrogen (H2), and neon (Ne) are covered on this page. The remaining fluids are listed on subsequent pages by molecular formula in the Hill order (see Introduction). The data have been taken from evaluated sources references are listed at the end of the table. 

Substances are listed by molecular formula in modified Hill order, with substances not containing carbon preceding those that do contain carbon. 

This table presents values for the first ionization energies (IP) of approximately 1000 molecules and atoms. Substances are listed by molecular formula in the modified Hill order (see introduction). Values enclosed in parentheses are considered not to be well established. Data appearing in the 1988 reference, were updated in 1996 for inclusion in the database of ionization energies available at the Internet site of the Standard Reference Data program of the National Institute of Standards and Technology (http //webbook.nist.gov). The list appearing here includes these updates. 

The substances are ordered by molecular formula in a modified Hill order, in which all substances not containing C (carbon) inorganic substances) are listed alphabetically before those that do contain C organic substances). The relative molar mass (molecular weight) M based on the lUPAC table of standard atomic weights (2005) and the primary names of all the isomers (substances having the same molecular formula) are also given (pp. 4-2 to 4-10). 

The mixtures are ordered by molecular formula in the modified Hill order (Chap. 4.1) of the substances, Component 1 being the substance that precedes in the Hill order the substances identified as Component 2. 

The table below provides information about cizeotropes for 808 selected binary systems. Compounds are listed in the modified Hill order, with carbon-containing compounds following those compounds not containing carbon. In columns 1 and 2 are the molecular formulas of components 1 and 2 written in the HiU convention. In column 3 the names of the components are given, either a systematic lUPAC name or a name in ubiquitous use. Columns 4, 5, and 6 contain the azeotropic coordinates of the mixtures temperature T z, pressure P z, and vapor-phase composition. The explanation of the type of azeotrope (column 7) is given by the following codes ... 

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