22. Which of the following points on the graph below is labeling a transition st

Question

22. Which of the following points on the graph below is labeling a transition state? IV 3 of A. 1 and V B. II and IV D. II only E. only 23. A proposed mechanism for the reduction of NO to N: by reaction with H is found below. Step 1 : H2(g) + 2 NO g) NOg) + HOO Step 2 : N20(g) + H2(g) Nig-H:0g) SLOW FAST What can we predict to be the rate law of the total reaction? A. R=k[H2][NO] B. R=k[N20][H2] C. R=k[N2][H20] D. R=k[H2][NO]2 E. R=k[N20][H20] 24. The entropy change in a system (ASsys) during a spontaneous process must be A. greater than zero. B. equal to zero C. less than zero. D. greater than or equal to zero. E. greater than, less than, or equal to zero.

Explanation / Answer

22) Transition states are generally local energy maximums having partial bonds. It represents the state before the formation of new molecule or intermediate. In the given energy profile diagram (reaction coordinate diagram) II and IV represent transition state and III represents an intermediate. Therefore answer is B

23) The rate of a chemical reaction is determined by the slowest step. Therefore, here rate law can be formulated form the first reaction(Slow)

rate = k [NO]2 [H2]

or

rate = k [N2O] [H2O]

Therefore option E represents the rate law of the overall reaction

24) According to the second law of thermodynamics,

S =qrev/T

Spontaneous heat transfer occurs only if Ssystem 0 ( NB: Suniverse > 0)

Therefore the answer is D

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