Given the following proposed mechanism. predict the rate law for the overall rea

Question

Given the following proposed mechanism. predict the rate law for the overall reaction. 2 NO_2 + CI_2 rightarrow 2 NO_2 Cl (overall reaction) Mechanism NO_2 + CI_2 rightarrow NO_2CI + CI slow NO_2 + CI rightarrow NO_2CI fast A) Rate = k[NO_2] [CI]^2 B) Rate = k[NO_2CI]^2[CI] C) Rate = k[NO_2CI][CI] D) Rate = k[NO_2][CI_2] Which of the following statements is FALSE? A) When K = 1, neither the forward or reverse reaction is strongly favored, and about the same amount of reactants and products exist at equilibrium. B) K >> 1 implies that the reaction is very fast at producing products. C) When K >> 1, the forward reaction is favored and essentially goes to completion. D) When K

Explanation / Answer

(14) In the reaction mechanism the slowest step involves one molecule each of NO2 & Cl2 , the order of the reaction with respect to NO2 & Cl2 are one & one respectively

Therefore the rate law is r = k[NO2][Cl2]

So option (D) is correct

(15) None of the given statements are FALSE

Therefore option (E) is correct

(16) N2(g) + 3H2(g) <----> 2NH3(g)

Equb conc(M) 1.5 1.1 0.47

Equilibrium constant , K = [NH3]2 / ([N2][H2]3)

= 0.472 / (1.5 x 1.13)

= 0.11

Therefore option (E) is correct

(17)

According to the Le-Charterlier's principle,

(1) If the temperature is raised, reaction will proceed in the direction in which some heat can destroy (absorbed) so that temperature of the system remains constant.

Thus increase in temperature shifts the equilibrium in the forward direction of those reactions which proceed with absorption of heat (endothermic reactions), and in the back ward direction of those reactions which proceed with the evolution of heat (exothermic reactions)

(2) If the pressure is increased, reaction will takes place in a direction which will bring about lowering f pressure. This implies that the equilibrium will shifts in the direction which produces the smaller no. of gas molecules.

(3)  If the concentration of reactants is increased or product is removed , the reaction will take place in the forward direction. If the concentration of reactants decreases or increasing the concentration of products the reaction will take place in the backward direction.

So correct option is (D)

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