Rate of reaction expression

The rate of reaction, expressed as the rate of product formation, is... 

The selective diene hydrogenation of monoterpenes such as myrcene, which contain both isolated monoene and diene moieties, forms a particular challenge [84]. The catalyst [RhH(CO)(PPh3)3] (60) has been reported to perform remarkably well for such hydrogenation reactions, and the diene moiety was shown to be selectively reduced to the monoene, while the isolated double bond remained unaffected under the reaction conditions used (Scheme 14.20). The rates of reaction expressed as average TOF (determined at ca. 80% conversion) ranged from ca. 640 (in benzene, 20 atm H2 at 100 °C) to 7600 mol mol 1 h 1 (in cyclohexane, 20 atm H2 at 80 °C). The hydrogenation in benzene solution resulted in... 

If 60% of the vaporized feed is cracked in the unit, what is the rate of reaction, expressed as -r (mols reacted/kg cat-s) and as r " (mols reacted/... 

If there were no side reaction, what was the rate of reaction expressed in terms of (a) N2, (b) H2 (a) From the coefficients in the balanced equation, An(N3) = — An(NH3). Therefore... 

Such an approach could explain, though in a semiquantitative way, the behavior of the systems studied earlier, when a minimum was observed on the kf versus solvent composition dependence. Analysis of the change in the rate of reaction, expressed as a product of the electrode reaction rate constant and the reactant concentration in the surface phase, c, in mixtures of water with acetone reveals a deep minimum, which corresponds to the greatest difference in composition of the surface and bulk phases. 

The rate of reaction, expressed as gram-moles of MCP produced per hour (Nm) per gram at catalyst (Wc), is represented by ... 

The rate of reaction expressed as molecules reacted (or formed) per unit time per catalytic site (or per exposed atom of active metal for metal catalysts) is called the turnover frequency. For supported metal catalysts the calculation requires knowledge of the dispersion, i.e., the fraction of the active metal available for adsorption of reactants. Boudart coined the term demanding (structure-sensitive) for catalyzed reactions for which the turnover frequency varies with the dispersion. Related to this is the ensemble effect, where the active site requires a specific multiatom grouping.f ... 

This book is different from conventional edited tomes, which collect assorted topics. I composed the first chapter as a comprehensive review of the field to be useful to experts and begirmers alike. The chapter presents broad coverage of different catalysts used in epoxidation. In the first part, it presents a review of the rates of reaction expressed as turnover frequencies in order to compare all catalysts on an equal footing. It is found that the turnover frequencies vary over 7 orders of magnitude in the following order ... 

The response (a decrease of viscosity) is a direct consequence of the action of the enzyme on its substrate, since the splitting of the glycosidic bonds gives a decrease in the viscosimetric average molecular weight and hydrodynamic volume of the hyaluronan chains and hence a decrease in the intrinsic and relative viscosities. With this method the rate at different concentrations cannot be compared because the initial viscosities are different and rheological measurements do not coincide. To eliminate these problems, a kinetic dilution methodology for the viscosimetric study of the substrate concentration dependence of the action of hyaluronidase was proposed [135,136]. We were able to determine the rate of reaction, expressed as the number of moles of bonds broken per unit of time, from viscosimetric data [136]. 

If there were no side reactions, what was the rate of reaction expressed in terms of (a) N2,... 

The rate of reaction (expressed by the symbol v) is equal to the concentration of one reactant multiplied by the concentration of the other reactant times k (constant for reaction rate). 

Kinetic analysis [6] of these reactions has yielded the following rate of reaction expressions for ethylbenzene and styrene ... 

In this inequality, we see the appearance of the rate of reaction (expression [1.2]), which is tantamount to writing that in order for a transformation to be possible, it is necessary for the affinity and rate to obey the condition ... 

Given the relative molecular mass of the enzyme (= 50,000), calculate the catalytic rate constant, (the maximum rate of reaction expressed in mole of product formed... 

The rate of reaction expressed in terms of quantum yield (< )) of disappearance of the reactant or the appearance of the product. 

Rate of Reaction Expressed as Concentration Change over Time... 

Some data extracted from Figure 20-2 are listed in Table 20.2 (in blue). Column 111 lists the concentration of H2O2 at the times shown in column I. Column 11 lists the arbitrary time interval between data points—400 s. Column IV reports the concentration changes that occur for each 400 s interval. The rates of reaction, expressed as the rate of disappearance of H2O2, are shown in column V. The data show that the reaction rate is not constant—the lower the remaining concentration of H2O2, the more slowly the reaction proceeds. 

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