Property change of reaction

The most commonly used standard property changes of reaction are as foUows ... 

The total derivative is appropriate here because property changes of reaction are functions of temperature only. In combination with Eq. (4-343) this gives... 

The data provided lead to the following property changes of reaction and equilibrium constants at 500 K ... 

The function A G° v,G° in Eq. (15.14) is the weighted difference (recall that the Vs are positive for products and negative for reactants) between the Gibbs energies of the products and reactants when each is in its standard state as a pure substance at the system temperature and at a fixed pressure. Thus the value of A G° is fixed for a given reaction once the temperature is established, and is independent of the equilibrium pressure and composition. Other standard property changes of reaction are similarly defined. Thus, for the general property M, we write... 

Since the standard-state temperature is that of the equilibrium mixture, the standard property changes of reaction, such as A G° and AH°, vary with the equilibrium temperature. The dependence of AG° on T is given by Eq. (15.16), which may be rewritten as... 

Molar or unit-mass value of any extensive property of pure species i Partial molar property of species i in solution Property change of mixing Standard property change of reaction j Mass... 

Standard Property Changes of Reaction A standard property change for the reaction... 

Thus the value of AG° is fixed for a given reaction once the temperature is established, and is independent of tire equilibrium pressure and composition. Othev standard property changes of reaction are similarly defined. Thus, for tire general properly M ... 

Multiplying by v, summing over all species, and invoking the definition of a standard property change of reaction yields ... 

T react to form I mol of L and m mol of M in their standard states also at temperature T. A standard state of species i is its real or hypothetical state as a pure species at temperature T and at a standard state pressure P°. The standard property change of reaction is given the symbol AMj, and its general mathematical definition is... 

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