The gas phase decomposition of nitrogen dioxide at 383 °C NO2 (g) ----> NO  (g) + ½ O2 (g) is second order in NO2 . In one experiment, when the initial concentration of NO2 was 0.211 M, the concentration of  NO2 dropped to  5.00 * 10-2M after 20.5 seconds had passed. Based on these data, the rate constant for the reaction is       M-1 s-1

The reaction A → B + C is found to be zero order. If it takes 4.2  102 seconds for an initial concentration of A to go from 0.58 M to 0.29 M, what is the rate constant for the reaction?

5. You studied the chemical reaction, 2NO2(g) → 2NO(g) + O2(g), at 25°C by monitoring the concentration of NO2(g) as a function of time and constructed the following graph. y= 0.5408x + 125.0 R2=0.998 Time (s) What is the rate constant for this reaction at 25°C? Include the proper units. (W/T) [(3)ONI/T

The reaction so2cl2(g)→so2(g)+cl2(g) is first order. At 660 k it has a rate contsant of 4.5 X 10^-2 s^-1 Determine the concentration of SO2Cl2 at 15.2 seconds, if the initial concentration is 0.583 M.

At a certain temperature this reaction follows first-order kinetics with a rate constant of 0.0066 s 2HI (g) → H, (g) + 12 (g): Suppose a vessel contains HI at a concentration of 0.220M. Calculate how long it takes for the concentration of HI to decrease to 6.0% of its initial may assume no other reaction is important. Round your answer to 2 significant digits.

What is the effective rate constant [in units that combine M and min] for the reaction with rate law v = k[A][B]2 where k = 0.54 M -2 min-1 if the initial concentration of B is 3.7 molar and that of A is 0.032 molar?

The decomposition of nitrous oxide at 565 °C N₂O(g) → N₂ (9)+½O₂(g) 1 is second order in N₂O with a rate constant of 1.10 × 10-³ M s If the initial concentration of N₂O is 2.16 M, the concentration of N₂O will be M after 1480 seconds have passed.

Under certain conditions the rate of this reaction is zero order in hydrogen iodide with a rate constant of 0.0022 M⚫s 1: 2 HI (g) →H₂ (g) +12(g) Suppose a 4.0 L flask is charged under these conditions with 250. mmol of hydrogen iodide. How much is left 7.0 s later? You may assume no other reaction is important. Be sure your answer has a unit symbol, if necessary, and round it to 2 significant digits. X x10