Concentration U1 CLC 4.16 Consider the following chain-reaction mechanism for the high-temperature formation of nitric oxide, i.e., the Zeldovich mechanism: ku O + Nz → NO + N Reaction 1 kzf N + Oz → NO + O Reaction 2 A. Write out expressions for d[NO]/dt and d[N]/dt. B. Assuming N atoms exist in steady state and that the concentrations of O, Oz, and Nz are at their equilibrium values for a specified temperature and composition, simplify your expression obtained above for d[NO]/dt for the case of negligible reverse reactions. (Answer: d[NO]/dt = 2ki; [O]eq [Nz]eq) C. Write out the expression for the steady-state N-atom concentration used in part B. D. For the conditions given below and using the assumptions of part B, how long does it take to form 50 ppm (mole fraction 10^-6) of NO? T = 210 K, p = 0.167 kg/m^3, MW = 28.778 kg/kmol, Xo = 7.6 * 10^-4 (mole fraction), Xoz = 3.025 * 10^-3 (mole fraction), In = 74 = 0.726 (mole fraction), kv = 1.82 * 10^(-38,370/T(K)) with units of cm^3/gmol.

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