Group 13 auxiliary data

All data for BCI(g) are taken from the assessment by Glushko et al. [81GLU/GUR], which are based on early CODATA compatible data. 

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If a reaction is sufficiently well balanced, its enthalpy change will be close to zero. For reactions (7)-(10), the experimental enthalpies of formation imply gas-phase reaction enthalpies (298.15 K) of 5674 + 7, —518 + 7, 52 + 7, and 30 + 7kJmol respectively. All quantum calculations can be avoided by assuming the reaction enthalpy to be zero for a well-balanced reaction. This is the basis of empirical methods such as Benson s group-additivity scheme [5,6]. Where adequate auxiliary data are available, a group-balanced reaction is an excellent choice for quantum chemistry calculations [121]. 

Used to present the heat and material balance of a process. This may be in broad block form with specific key points delineated, or in more detailed form identifying essentially every flow, temperature and pressure for each basic piece of process equipment or processing step. This may and usually does include auxiliary services to the process, such as steam, water, air, fuel gas, refrigeration, circulating oil, etc. This type of sheet is not necessarily distributed to the same groups as would receive and need the piping flowsheet described next, because it may contain detailed confidential process data. 

The Auxiliary Functions Menu Is used less frequently than the other two menus. The first function creates a disc file that steers the online data reduction process in a manner chosen by the user. Seme adaptability is necessary here because procedures for picking baselines, etc. will vary from one group of specimens to another. 

Answer 12.6 The most important and most informative wells have to be selected for full analyses. The criteria will include the following (a) at least five samples to establish the local intake line (how will they be selected ) (b) the rest of the samples will be selected so that they include representatives of all water groups present (i.e., waters from different stratigraphic units, and hence possibly of different aquifers, and waters from the widest range of salinity) (c) wells with large yield are most important, as they represent larger portions of the exploited resource (d) wells with much historical data (time series) are preferable, since the chance to understand their systems is greater if more auxiliary information is available. 

The thermochemical data for auxiliary substances at 298.15 K have been taken from the CODATA Key Values for Thermodynamics [4], the reference base recommended for use in accurate work. Values at other temperatures are derived using enthalpy differences as indicated above, except for water, for which the enthalpy differences are consistent with the new NBS/NRC Steam Tables [16]. These are shown in Table 2. Molar masses are calculated from the lUPAC 1981 Atomic Weights [17]. The value for the gas constant, R=8.31448 J/(mol.K)-l, which is needed in the calculation of volumes, is from the set that is currently being recommended to CODATA by its Task Group on Fundamental Constants [35]. Thus all of these data are up-to-date and internationally recognized. 

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