3. The reaction 2NO,-, 2NO + O, obeys the nto law 02 -(140 × 10.2 sec)(NC), l\'a

Question

3. The reaction 2NO,-, 2NO + O, obeys the nto law 02 -(140 × 10.2 sec)(NC), l'a 506 K. Ir the initial concentration of NO, is 1.00 M how long wi a r e 28.2% of its initial value? A) cannot be determined from this data B) 182 s C) 1.40 10 D) 51.3s E) 90s The OH OH radical disproportioriates according to thg demennin (asmial "wiin · + OH H, 0+ O This reaction is second order in OS6 Thg 0iin " " em/molecules at room temperature. If the initiad on5 molecules/em2, what is the first hal-life for the reaction A) 3.0×10's B) 6.7x 10-" C) 3.3x10 D) 3.5×10" s E) 1.7×10% Use the following information to determine the activation 2NO N2 +02 Rate Constant Temperature Kelvin) 1 500 A) 6.9x 10' J/mol B) 1.3×10, J/mol C) 2.7x 10' Jimol D) 3.3 x 10' J/mol E) 9.3x 10' J/mol

Explanation / Answer

Ans 5

From the Arrhenius equation

ln k2 /k1 = (Ea/R) *(1/T1 - 1/T2)

ln (0.674/0.143) = (Ea/8.314) * (1/1400 - 1/1500)

1.5503 = Ea x 5.727 x 10^-6

Ea = 2.7 x 10^5 J/mol

Option C is the correct answer

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