For the decomposition of ammonia on a platinum surface at 856 °C 2 NH3N2 +3 H2 the average rate of disappearance of NH3 over the time period from t = 0 s to t= 3406 s is found to be 1.50×10-6 M s. The average rate of formation of H, over the same time period is |Ms!.

For the decomposition of dinitrogen pentoxide in carbon tetrachloride solution at 30 °C 2 N205 4 N02 + 02 the following data have been obtained: [N2O5], M 0.271 0.171 0.107 6.75x10-2 time, min 113 226 339 The average rate of disappearance of N205 over the time period from t = 0 min to t 113 min is M min.

For the decomposition of dinitrogen pentoxide in carbon tetrachloride solution at 30 °C 2 N½O54 NO2 + O2 the following data have been obtained: N2O5], M 0.843 0.513 0.313 0.190 time, min 121 242 363 The average rate of disappearance of N205 over the time period from t= 242 min to t= 363 min is M min

In a study of the decomposition of hydrogen iodide on a gold surface at 150 °C HI(g)% H,(g) + % »(9) the following data were obtained: HI], M seconds 0.274 0.137 6.85×10-2 3.43x10-2 521 782 912 Hint: It is not necessary to graph these data. (1) The observed half life for this reaction when the starting concentration is 0.274 M is s and when the starting concentration is 0.137 M is (2) The average rate of disappearance of HI from t= 0s to t= 521 s is| Ms!. (3) The average rate of disappearance of HI from t= 521 s to t= 782 s is| Ms! (4) Based on these data, the rate constant for this | | order reaction is Ms!.