4. A certain gaseous substance decomposes at 127C according to the equation: A2B Prior to the experiment, all the air was evacuated from the reactor with a vacuum pump, and then filled with A until the internal pressure reached 1.25atm. Then the reactor was heated, and the reaction begun. The rates were calculated in two different moments, once when the completion of the reaction was at 25.0%, and again at 65.0%. If the rate values obtained were 0.375atmmin1, and 0.256atmmin1, respectively: a) Determine the order of the reaction. b) Calculate the rate constant. c) What was the pressure inside the container when 50% of A was consumed? When did that happen? 5. The dinitrogen pentoxide (N2O5) is a solid at room temperature. At a relative low temperature (320K) it sublimates, and if the temperature keeps increasing beyond 600 K, it decomposes according to the equation: 2N2O5(g)O2(g)+4NO2(g) A study of this reaction yielded the following results: a) Using a graphical method, and assuming the reaction follows simple kinetics (either 0th,1st or 2nd order), determine the reaction order. b) Determine the rate constant for the reaction. c) How long will it take to consume 75% of the reactant? d) Calculate the partial pressure of NO2 after 1.50 seconds. NOTE: Include the graph(s) in your