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Unformatted text preview: 7.1. ISOTHERMAL, ISOCHORIC KINETICS 233 1 exp(- E /(R T)) T E / R j j Figure 7.1: Plot of exp( E j / R/T ) versus T ; transition occurs at T E j / R . for small T , the modulation is extreme, and the reaction rate is very small, for T E j / R , the reaction rate is extremely sensitive to temperature, and for T , the modulation is unity, and the reaction rate is limited only by molecular collision frequency. Now O and O 2 represent molar concentrations which have standard units of mole/cm 3 . So the reaction rates d O dt and d O 2 dt have units of mole/cm 3 /s . Note that after conversion of E j from kJ/mole to erg/mole we find the units of the argument of the exponential to be unitless. That is bracketleftbigg E j RT bracketrightbigg = erg mole mole K erg 1 K dimensionless . (7.41) Here the brackets denote the units of a quantity, and not molar concentration. Let us get units for the collision frequency factor of reaction 13, a 13 . We know the units of the rate....
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This note was uploaded on 11/26/2011 for the course EGN 3381 taught by Professor Park-sou during the Fall '11 term at FSU.
- Fall '11