47. For the photochemically driven reaction of H2 with 12, a possible mechanism

Question

47. For the photochemically driven reaction of H2 with 12, a possible mechanism is 2 h21 With this mechanism the number of HI molccules produced per photon absorbed is (A) greater than one. (C) equal to one. The units for heat flux are (A) Jsm2 (C) Js-1 A plausible mechanism for the decomposition of ozone is (B) (D) less than one. always a whole number. 48· (B) s1 (D) sm-2 49. 0+03?02 +02 Using the steady-state approximation, [O] is nearly constant over a large time period and approximately equal to (B) O[M] (D) zero 50. For the reaction kr the forward and reverse reactions are first order. The cquilibrium constant for this reaction is related to the kr and &r; by (A) kk(B k(C) kk (D) kr-kr The mean free path for a spherical gas molecule is inversely proportional to 51· (A) (B) the radius of the molecule. the diameter of the molecule. (C) the square root of the radius of the molecule. (D) the square of the diameter of the molecule. At what temperature will the average velocity of He be equal to that of N2 at 298 K? 52. (A) (298 K)X4/28) (C) (298 K28 (B) 298 K)(284-i2 (D) (298 K)(28/4)

Explanation / Answer

Ans 47 : A) greater than one

The mechanism shows the formation of HI , which occurs thriugh four steps.

The proton is absorbed in the first step , and the HI molecules are formed in second and third step.

So overall two HI molecules are formed per proton absorbed in the reaction.

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