QUESTION 1 For the reaction: NO +O3 --> NO2 + O2 the second-order rate constant has a value of 1.8 x 10-14 molecule-1 cm3 s-1 at 25 oC. If, in a relatively clean atmosphere, the concentrations of NO and O3 are 0.34 ppbv and 14 ppbv, respectively, what is the rate of NO oxidation in units of molecules cm-3 s-1? Assume 1.00 atm pressure. Answer in scientific notation to two significant figures. The format for 0.0010 would be 1.0e3 or 1.0E3 Do not use spaces.

At a certain temperature the rate of this reaction is first order in NH4OH with a rate constant of 3.35 s¯¹: NH,OH (aq) → NH, (aq)+H,O (aq) 4 Suppose a vessel contains NH4OH at a concentration of 0.260M. Calculate the concentration of NH4OH in the vessel 0.230 seconds later. You may assume no other reaction is important. Round your answer to 2 significant digits. M ■ x10 X

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- 1 Under certain conditions the rate of this reaction is zero order in ammonia with a rate constant of 0.0038 M's : 2 NH3 (g) - → N, (g) + 3 H2 (g) Suppose a 450. mL flask is charged under these conditions with 350. mmol of ammonia. How much is left 50. s later? You may assume no other reaction is important. Be sure your answer has a unit symbol, if necessary, and round it to the correct number of significant digits.

1. In the reaction below, chlorine dioxide (CIO2), a reddish-yellow gas that is soluble in water, yields CIO; and CIO2- ions in a basic solution. In a series of experiments, the following initial rates of disappearance of CIO2 and OH- were obtained. What is the value of the rate constant? 2CIO2 (aq) + 2OH-(aq) → CIO3- (aq) + CIO2- (aq) + H20 Initial concentrations CIO2- CIO2 OH- Initial Rate Exp 1 0.680M 0.256 M 4.0772 M/s Exp 2 0.227 M 0.256 M 0.1506 M/s Exp 3 0.227 M 0.767 M 0.1517 M/s

Under certain conditions the rate of this reaction is zero order in hydrogen iodide with a rate constant of 0.0017 M.s¹: Suppose a 300. mL flask is charged under these conditions with 450. mmol of hydrogen iodide. How much is left 200. 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. 2 HI (9) H2(g)+1₂(g) B = X x10

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