Material Balance Interpretation of

As in the case of a batch reactor, the balance equation 2.3-3 or 2.3-4 may appear in various forms with other measures of flow and amounts. For a flow system, the fractional conversion of A (/A), extent of reaction (f), and molarity of A (cA) are defined in terms of Fa rather than nA  

If density is constant, which is usually assumed for a liquid-phase reaction (but is usually not the case for a gas-phase reaction), equation 2.3-11 takes a simpler form, since q0 = q. Then 

Far a liquid-phase reaction of the type A +. . . products, an experimental CSTR of volume 1.5 L is used to measure the rate of reaction at a given temperature. If the steacty-state feed rate is 0.015 L s 1, the feed concentration (cAo) is 0.8 mol L-1, and A is 15% converted on flow through the reactor, what is the value of (- rA)  

2For comparison with the definition of the species-independent rate, I, in footnote 1 of Chapter 1 (which corresponds to equation 2.2-2 for a BR), 

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