T. Gierczak, R.K. Talukdar, S.C. Herndon, G.L. Vaghjiani, and A.R. Ravish Ankara (J. Phys. Chem. A 101, 3125 (1997)) measured the rate constants for the bimolecular gas-phase reaction of methane with the hydroxyl radical in several isotopic variations. From their data, the following Arrhenius parameters can be obtained:

Compute the rate constants at 298 K, and interpret the kinetic isotope effects.

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A/(dm' mols) 1.13 x 10° 6.0 x 10 1.01 x 10° E,/(k) mol) 14.1 CH, + OH CH,+H,0 CD, + OH CD, + DOH CH, + OD CH, +DOH 17.5 13.6