3. In a series of experiments on the decomposition of dinitrogen pentoxide, N:Os, rate constants were determined at two different temperatures. At 35°C, the rate constant was 1.4 x 10s; at 45°C, the rate constant was 5.0 x 104/s. What is the activation energy for the reaction? (R-8.314 J/K mol) (2 points) 4. Sulfuryl chloride, SO2Cl2, decomposes when heated. (2 points) SO₂Cl2(g) SO2(g) + Cl2(g) The reaction is first order. In an experiment, the initial concentration of SO₂Cl₂was 0.0248 mol/L. The rate constant is 2.2 x 10%/s. a) What is the concentration of SO₂Cl₂ after 2.0 hr? b) Calculate the half-life? 5. Consider this 2-step mechanism for a reaction. (2 points) NO2(g) + Cl2(g) K NO:(g) + Cl(g) k2 CINO2 (g) +Cl(g) CINO:(g) Slow Fast a. What is the overall reaction? b. Identify the intermediates in the mechanism. c. What is the predicted rate law?