10. Consider the first-order reaction A → B in which A molecules (unshaded spheres) are converted to B molecules (shaded spheres). Given the following pictures at t = 0 seconds and t= 100 seconds, which picture represents the number of A and B molecules remaining at 300 seconds? t = O seconds 100 seconds

A certain reaction is second order in N2 and second order in H2 . Use this information to complete the table below. Be sure each of your answer entries has the correct number of significant digits. N2 H2 initial rate of reaction 1.18M 1.86M ×8.00105/Ms 0.579M 1.86M /Ms 0.398M 5.52M /Ms

Consider the reaction and the information in the table provided.  Calculate the average rate of formation of P2O5 between 20.0s and 40.0s.    2H3PO4 → P2O5 + 3H2O Time (s) 0.0 10.0 20.0 30.0 40.0 50.0 Conc P2O5 (M) 0 0.00120 0.00420 0.00600 0.00720 0.00780

F8 =9 =10 = 11 = 12 = 13 14 = 15 16 18 19 At a certain temperature this reaction follows second-order kinetics with a rate constant of 0.0618M-¹.s-¹: 2NH3 (g) → N₂ (g) + 3H₂ (g) Suppose a vessel contains NH3 at a concentration of 1.25 M. Calculate the concentration of NH3 in the vessel 68.0 seconds later. You may assume no other reaction is important. Round your answer to 2 significant digits. OM ? Su ontinue 0 10 X S hp

Consider the mechanism. O3 + NO, – NO, + O, NO, + NO, – N,O5 slow fast O, + 2 NO, – 0, + N,O5 Identify the rate law for the overall reaction based on the mechanism. rate = k[O,||NO,? rate = k[O3] rate = k[O3][NO,1 rate = k[NO,? k[NO, ][NO3] rate =

A certain reaction is first order in N, and second order in H,. Use this information to complete the table below. Be sure each of your answer entries has the correct number of significant digits. [N] [4.] initial rate of reaction x10 1.91 M 0.885 M 0.894 M/s olo 0.813 M 0.885 M I|| M/s Ar 0.213 M 7.92 M

Consider a first-order decomposition of the substance A. It takes 60 min ufor the concentration of A to drop to half its initial value. How long, in total, will it take for the concentration of A to fall from its initial value to 12.5%? Select one: 1. 45 min 2. 15 min 3. 180 min 4. 120 min 5. None of the other answers

Consider the gas phase reaction 2 NO + H₂ → N₂O + H₂O The experimental rate law is found to be R = [NO]²[H₂] Which of the mechanisms shown below is consistent with the information about this reaction given in this question? Step 1: NO + H₂ → N + H₂O (slow) Step2: N + NO → N₂O (fast) Step 1: NO + NO 2 NO₂ + N (slow) (fast) Step2: NO₂ + H₂ Step 3: N + NO → NO + H₂O N₂O (fast) Step 1: NO + NO>>> N₂O₂ Step2: N₂O₂ + H2 →→ N₂O + H₂O 2H (fast) Step 1: H₂ Step2: H+2 NO → Step 3: H+ OH → N₂O + OH (slow) H₂O (fast) (fast) (slow)

A+ B+ 2C - 2D+ 3E where the rate law is A[A] k[A][B]* Rate = - %3D At An experiment is carried out where [A], = 1.0 x 10-2 M, [B, = 6.0 M, and [C, = 2.0 M. The reaction is started, and after 8.0 seconds, the concentration of A is 3.8 x 10-3 M. a. Calculate the value of k for this reaction. k%3= L mols 1 b. Calculate the half-life for this experiment. Half-life = c. Calculate the concentration of A after 17.0 seconds. Concentration= M d. Calculate the concentration of C after 17 seconds. Concentration=