複選題23. Consider the collision-induced dissociation of N2Os(g) via the following mechanism: The * symbol in the first reaction indicates the reactant is activated through collision. Experimental ly, it is observed that the reaction can be either first or second order under different conditions. The rate law is expressed as . Which of the following statement is true? (A)m = 2. (B) k'=k1 (C) (D)When , the reaction will be first order in N2O5(g). (E) When , the reaction will be half order in N2O5(g).

複選題22. The velocity probability of Maxwell-Boltzmann distribution in one-direction is expressed as: . Which of the following statement about Maxwell- Boltzmann distribution at a finite T is true? (A) The most-probable velocity for a one-dimensional gas velocity distribution is zero. (B) The Maxwell-Boltzmann speed (three dimensions) distribution approaches zero at high speeds. (C) The Maxwell-Boltzmann speed (three dimensions) distribution approaches zero at low speed. (D) The total energy of one mole perfect gas according to the Maxwell-Boltzmann distribution is 1.5RT. (E) Most-probable speed ＞ Mean speed ＞ Root mean square speed.

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