43) A reaction follows the following two-step mechanism. Slow A2 + B-A2B Fast Ov

Question

43) A reaction follows the following two-step mechanism. Slow A2 + B-A2B Fast Overall: 2A + B = A2B What is the rate law? A) Rate -k[A B) Rate-kIAI [B] C) Rate kAJIB) D) Rate-kAIB] 44) Which of the following conditions must be met for a chemical reaction to happen in gas phase? A) Molecules must collide. B) Molecules must collide with proper orientation. C) Molecules must have the activation energy D) All of the above conditions must be met. 45) The graph represents the first-order decomposition of N,05(g) to form NO,g) and 02 What will be the NOs concentration after 7.0 hours? 1.4 13 0.9 0.8 0.6 05 0.4 03 01 0 12 45 6789 0 Time [t) in hours A) 0.18 mol/L B) 0.70 mol/L C)0.14 mol/L D) 0.10 mol/L 46) The graph represents the first-order decomposition of N,O(g) to form No. (g) and 02 (g). N,05 (g) 2N02 (g) +1/22 (g) What is the estimated rate constant? A) 0.28 hr1 B) 0.70 hr-l C) 0.58 hr1 D) The data is insufficient to calculate rate constant.

Explanation / Answer

43) ANswer A ( because onlt reactant A is present in slow step)

44) Answer D ( all are correct)

45) Answer A ( at 7.0 hrs [N2O5] = 0.2mol/L, after 7 hrs it would be less than 0.2 i.e, 0.18 mol/L

46) Answer A (change in concentration/time = 0.8-0.5/3-2 = 0.28 M/hr)

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