Moles in gas phase

Gg is the molar free energy of the gas phase Gi is the molar free energy of the liquid phase dng is the differential change in moles in gas phase drii is the differential change in moles in liquid... 

J volume (mole) fraction of oxygen in gas phase dimensionless... 

Fq = molar flow rate of inerts in the gas phase, kmol/s Fy = molar flow rate of inerts in the liquid phase, kmol/s X = moles A/mole inert in liquid phase, dimensionless Y = moles A/mole inert in gas phase, dimensionless Vy = volume of liquid in vessel, m t= time, s... 

Dipole Moments (Debyes) in Gas Phase and in Aqueous Solution," and Aqueous Polarization Energies (kcal/mole),4 Computed by a QM/MM Discrete Molecular Solvent Method, Using The AMI Solute Hamiltonian. 

Y = moles of solute gas A/mole of inert gas B in gas phase, and X = moles of solute A/mole of inert solvent in liquid phase. 

CJ, O2 concentration in gas phase over catalyst particle, lb moles/ ft ... 

Reactions with a large, positive entropy change also favor product formation (large Kp). For example, a reaction with a net increase in the number of moles of gas-phase species has a very positive A S°, from the translational entropy gain associated with the additional species. If AS° > 0, high temperatures increase Kp and drive the reaction toward completion (toward the products). If A5° < 0, Kp will increase as the temperature goes down. 

In gas-phase chemistry it is straightforward to specify the concentrations of all of the chemical species, such as by a single array of the species mole fractions, which sums to unity. The situation can be much more complex in heterogeneous reactions. For example, there may be multiple, distinct solid phases, or different types of surfaces or materials all present simultaneously. The formalism that we describe is a very general and systematic way to account for the different groupings and normalization constraints among many col-... 

Cdg Concentration of D in gas phase, moles/volume Cdp Concentration of D in crystallite phase, moles/zeolite pore volume Deff Effective diffusion coefficient, (length) 2/time F Volumetric feed rate to reactor, volume/time H Henry s law-type constant relating gas phase mole fraction to crystallite phase mole fraction... 

Figure 1.9. The dependence of the boundary profile on the form of the partition isotherm. (Courtesy of John Wiley-Interscience. ) c=concentration (cm 5/mole) of solute in gas phase q=concentration in liquid or adsorbed phase t=time for band to emerge from column (1) se1f-sharpening profile (2) diffuse profile (3) gaussian profile.

Y = moles of one solute in gas phase per mole of rich feed gas... 

The amount of energy necessary to break one mole of bonds of a given kind (in gas phase). 

Fig. 4. Adsorption of mixtures of C2H4 and C2H6 on NaX at 20 C for 10 mole % ethylene in gas phase. The individual isotherm for C2H4 is the difference between the total and the individual isotherm plotted for C2H6.

Total concentration of two hydrocarbons in gas phase was 2000 ppm (0.2 kPa). The mole fraction of 224 trimethylpentane and toluene was assumed of 0.5 and 0.5, respectively. The concentration of supplied O2 concentration was 0.18 kPa, and the velocity was 7.57E-2 m/s. In all cases, 224 trimethylpentane was emitted first, but the reaction was started lately. It matches to the results of adsorption equilibrium and conversion experiments. The proposed model described the experimental data properly. 

A situation in which a varying flow rate occurs quite frequently is in gas-phase reactions that do not have an equal number of product and reactant moles. For example, in the synthesis of ammonia,... 

Calvert et al. have further shown that l,l -azoisobutane in hexane solution quenches the phosphorescence (and not the fluorescence) of biacetyl with a rate coefficient of 2 x 10 l.mole sec" at, which is only slightly lower than the diffusion controlled rate coefficient. In gas phase experiments energy transfer has been demonstrated from triplet biacetyl and acetone with near collision efficiency... 

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