Gibbs eneigy

Fignre 9.12. Schematic diagram showing fbuidi iteration stage in the Gibbs eneigy minimisation process of an alloy with conqmsition xo Ni-Cu at 1523 K. 

The Molar Gibbs Eneigy and Fugacity of a Pure Component 290... 

Both these values are consistent with the relevant vapour pressures studies discussed in Section Vin.4.1.4. The selected value for the Gibbs eneigy of formation is ... 

Generalized charts are applicable to a wide range of industrially important chemicals. Properties for which charts are available include all thermodynamic properties, eg, enthalpy, entropy, Gibbs eneigy and PVT data, compressibility factors, liquid densities, fugacity coefficients, surface tensions, diffusivities, transport properties, and rate constants for chemical reactions. Charts and tables of compressibility factors vs reduced pressure and reduced temperature have been produced. Data is available in both tabular and graphical form (61—72). 

If we knew the activation Gibbs eneigy, we could use eqn 24,81 to compute (Hda) from either rate constant, and we can compute the activation Gibbs energy from eqn 24.82 ... 

The excess Gibbs eneigy in a phase (p, in which

liquid solutions was evaluated by [19970ht, 2003Mie] using die following model ... 

Jones G, Dole M (1929) The viscosity of aqueous solutions of strong electrolytes with special reference to barium chloride. J Am Chem Soc 51 2950-2964 Kalidas C, Hefter GT, Marcus Y (2000) Gibbs eneigies of transfer of cations from water to aqueous organic solvents. Chem Rev 100 819-852... 

Lowercase roman letters usually denote molar properties of a phase. Thus, g. A, s, and i are the molar Gibbs eneigy, molar enthalpy, molar entropy, and molar volume. When it is essential to distinguish between a molar property of a mixture and that of a pure component, we identify the pure-component property by a subscript. For example. A, is the molar enthalpy of pure i. Total propetties are usually designated by capital l rs. Thus Afis the total enthalpy of a mixture it is related to die molar mixture enthalpy A 1 H nh, where it is the total number of moles in the mixture. 

Numerical calculations of phase equilibria require thermodynamic data or correlations of data. For pure con nents, the requisite data may include saturation pressures (or temperatures), heat capacities, latent heats, and volumetric properties. For mixtures, one requires a PVTx equation of state (for determination of /), and/or an expression for the molar excess Gibbs eneigy (firr determination of y,). We have discussed in Sections 1.3 and 1.4 the correlating capabilities of selected equations of state and expressions for g, and the behavior of the ftigacity coefficients and activity coefficients derived ftom them. 

Ait-Kaci, A. Belaribi, G. Michou-Saucet, C. Jose, J. liquid-vapor equilibrium and excess Gibbs eneigy of 1-hexyne + heptane Int. DATA Ser., Sel. Data Mixtures, Set. A 1992,20,32-34... 

Jain, D. V. S. Yadav, O. P. Vapour pressures excess Gibbs eneigies for the binary mixtures of ethylbenzene with cyclohexane carbon tetrachloride Indian J. Ghent. 1974,72,718-720... 

Gierycz, P. Gregorowicz, J. Malanowski, S. Vapour pressures and excess Gibbs eneigies of (butrm-l-ol + n-octane or... 

Standard Gibbs-eneigy fijnctions (A G" eq. 2) of formation of barium cuprates from oxides according to Voronin and Degterov (1994) units have been omitted... 

Consider a solution. The excess Gibbs eneigy, according to the definition, will be ... 

Another way of defining a gas is to express a characteristic fiinctioa The most common example chosen is molar Gibbs energy, in the case of a pure gas, often interchangeable with chemical potential. Here we are focusing on the choice of variables P and T, and we aim to determine the chemical potential (or molar Gibbs eneigy) of the pure gas from the state equation written in the form ... 

Table 5.5 Relative Gibbs eneigies in DCM (A Gdcm. kcal - mol ) at 298 K for the ionic mechanism with the different 4-substituted phenylacetylenes (R = H, CF3, OMe, NMe2>...

Horst R (1998) Computation of unstable binodals not requiring concentration derivatives of the Gibbs eneigy. J Phys Chem B 102(17) 3243... 

Ferino, L Marongiu, B. Solinas, V. Torrazza, S. Kehiaian, H. V. Thennodynamic properties of binary mixtures containing tertiary amines.I.Excessenthalpies of some N,N-diaIkylmethylamine+noimal alkane mixtures measurement and analysis in terms of group contributions estimation of excess Gibbs eneigies Fluid Phase Equilib. 1982,9,49-65... 

Standard entropy Standard vapor Gibbs eneigy... 

Using the Gibbs eneigy density, the second partial term becomes the partial molar entropy of species i... 

Neglecting the mechanical energy term, the Gibbs eneigy for the formation of a spherical embryo of vanadium caibonitride from the elements in solid solution is classically expressed as the sum of a volume and an interface term ... 

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