Studies of combustion reactions depend on knowing the concentrations of H atoms and HO radicals. Measurements on a flow system using EPR for the detection of radicals gave information on the reactions

(I.N. Bradley, W. Hack, K. Hoyermann, and H.G. Wagner, f. Chem. Soc. Faraday Trans. 1, 1889 (1973)). Using initial H atom and NO2 concentrations of 4.5 x 10-10 mol cm-3 and 5.6 X 10-10mol cm-3, respectively, compute and plot curves showing the O, O2' and OH concentrations as a function of time in the range 0-I0 ns.

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k, = 2.9 x 1010 dm' mol-s k, = 1.55 x 10° dm' mols k, = 1.1 x 1010 dm' mol's (1) H+NO, OH +NO (2) OH+OH-→H,0+0 (3) O+OH →0, +H