Hydrogen abstraction from hydrocarbons by atomic chlorine is a mechanism for Cl · loss in the stratosphere. Consider the reaction of Cl· with ethane: C₂H₆(g) + Cl· (g) †’ C₂H₅· (g) + HCl(g). This reaction was studied in the laboratory, and the following data were obtained.

a. Determine the Arrhenius parameters for this reaction.

b. At the tropopause (the boundary between the troposphere and stratosphere located approximately 11 km above the surface of the Earth), the temperature is roughly 220 K. What do you expect the rate constant to be at this temperature?

c. Using the Arrhenius parameters obtained in part (a), determine the Eyring parameters ΔH^€¡ and ΔS^€¡ for this reaction.

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10-10 k (Ms) T (K) 270. 3.43 370. 3.77 470. 3.99 570. 4.13 670. 4.23