The stoichiometric numbers provide relations among the changes in mole numbers of chemical species which occur as the result of chemical reaction. Thus, for reactionj [Pg.500]

The final number of moles can then easily be calculated knowing the stoichiometric number as shown in Tab. 2.3. [Pg.32]

Transfer Coefficient, Symmetry Factor and Stoichiometric Number [Pg.1207]

The lepiesent formulas for the chemical species and is the stoichiometric number for species i in reaction j. Each has a magnitude and a sign [Pg.500]

In a multistep reaction the number of times the r.d.s. must occur for each act of the overall reaction is referred to as the stoichiometric number v, and this concept can be illustrated by referring to the steps of the h.e.r. [Pg.1207]

In many electrochemical reactions the individual steps differ in their stoichiometric numbers, in contrast to what was found for reactions of the type of (13.2). A two-step reaction can generally be formulated as [Pg.227]

If we simply add the three steps, we do not recapture (A). To get around this, we introduce the stoichiometric number, s, for each step, as the number by which that step must be multiplied so that addition of the steps results in (A) [Pg.156]

Describe clearly the use of polarographic analysis for obtaining the values of the formation constant and stoichiometric number of metal complexes. [Pg.99]

Matrix methods, in particular finding the rank of the matrix, can be used to find the number of independent reactions in a reaction set. If the stoichiometric numbers for the reactions and molecules are put in the form of a matrix, the rank of the matrix gives the number of independent reactions. See Amundson, N. R., Mathematical Methods in Chemical Engineering, Prentice-Hall, Englewood Cliffs, N.J. (1966, p. 50). [Pg.42]

In this equation, it has been assumed that the adatom exerts the same blockage on hydrogen and anion adsorption (i.e., the stoichiometric number m is the same for [Pg.214]

If it is known which of the reactions determine the rate of the overall complex electrode process, then the concept of the stoichiometric number of the electrode process v is often introduced. This number is equal to the number of identical partial reactions required to realize the overall electrode process, as written in an equation of type (5.2.2).t If the rate constant of this partial rate-determining reaction is ka, then ka = /ca/v. Thus, for example, if the first of reactions (5.1.7) is the rate-determining step in the overall electrode process (5.1.4) then the stoichiometric number has the value v = 2. [Pg.265]

One model proposed for the rate of propylene disappearance, rp, as a function of the oxygen concentration, C0, the propylene concentration, Cp, and the stoichiometric number, n, is [Pg.297]

Methanol. Methanol is produced by stoichiometric reaction of CO and H2. The syngas produced by coal gasification contains insufficient hydrogen for complete conversion to methanol, and partial CO shifting is required to obtain the desired concentrations of H2, CO, and CO2. These concentrations are expressed in terms of a stoichiometric number, ((H2 — CO)/(H2 + CO2), which has a desired value of 2. In some cases CO2 removal is required to achieve the stoichiometric number target. CO and H2 are then reacted to form methanol in a catalytic methanol synthesis reactor. [Pg.276]

Here, Ais the free energy change of Reaction 17.3 (kJ mol 1), R is the gas constant (8.3143 J K-1 mol-1), and 7k is absolute temperature (K). Factor co is the reciprocal of the average stoichiometric number, which can be taken as the number of times the rate determining step in Reaction 17.3 occurs per turnover of the reaction (Jin and Bethke, 2005). [Pg.248]

Taking the rate limiting step in the electron transport chain to be trans-membrane proton translocation, which occurs about five times per sulfate consumed (Rabus et al., 2006), the average stoichiometric number x (entered into REACT as to = 1/x) for Reaction 18.7 is five. Sulfate reducers conserve about 45 kJ mol-1 of sulfate consumed (Qusheng Jin, unpublished data), so we set AGp to this value and m to one. From equations 18.12 and 18.14, then, we can write [Pg.265]

The total enthalpy correction due to chemical reactions is the sum of all the enthalpies of dimerization for each i-j pair multiplied by the mole fraction of dimer i-j. Since this gives the enthalpy correction for one mole of true species, we multiply this quantity by the ratio of the true number of moles to the stoichiometric number of moles. This gives [Pg.136]

The slope of the Tafel curve drj/d log / is only one of the criteria that are required to determine the mechanism of the h.e.r., since different mechanisms, involving different r.d.s. often have the same Tafel slope. Parameters that are diagnostic of mechanism are the transfer coefficient, the reaction order, the stoichiometric number, the hydrogen coverage, the exchange current density, the heat adsorption, etc. [Pg.1209]

It is worth noting that the values of both k+ and co in Equation 17.9 depend on how the kinetic reaction (Reaction 17.3) is written. If we were to arbitrarily double each of the reaction s coefficients, the value of the rate constant k+ would be cut in half, because twice as many of the reactant species would be consumed, and twice as many product species produced, per reaction turnover. The rate determining step, furthermore, would occur twice as often per reaction turnover, doubling the average stoichiometric number and requiring co to be halved as well. [Pg.248]

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