Task

The reaction 2NO(g) + O₂(g) → 2NO₂(g) is treated as elementary, i.e. its rate obeys the law of mass action. Initially [NO] = 0.4 mol/L and [O₂] = 0.3 mol/L; after 20 s the NO concentration fell to 0.2 mol/L. The temperature coefficient of the reaction is γ = 2.5. 1) Write the rate law and calculate how many times the forward rate increases if the pressure is tripled at constant temperature. 2) Calculate the average rate over the first 20 s with respect to NO and to O₂ (mol/(L·s)). 3) Determine how many times the instantaneous rate at 20 s is smaller than the initial rate. 4) Find by how many degrees the temperature must be raised to increase the rate 39.0625 times. For every part, show the method (reaction equations, formulas, reasoning) and all calculations step by step.