Question

Issue: can cause adverse health effects blc it can form into smogt acid rain 3. NOx is the precursor of red haze (the formation of N204). The single step mechanism is second order: 2 NO2 → N204 With a rate constant at 800°C of 2.5 x 10-10 cm3/(molecule sec), and energy of activation of 26.5 kJ/mol. a. Write the rate law for this step. ZNO 2 N2O4 rate=k [Noz]² b. Calculate the rate of reaction at 1000°C. niti In pur- calling u muide 2 Ado

Answer 1

2 NO N,04 Rate law hor zhis honetun s m rale k.CNg uhore ke nate constant CNO NO cencentralea [No7 hale mecrder of heaclon Since, in 2he question i said hat heaction follocs Jhe socond ardor and Lhe rate consdant molecule se 2.5 X101c CM tomperature T 300 c, 2xpresion the hecomas 2 10x 10L/mel. see LNo 2.5X10 rale = 2.5 x 1013 L/mel soe [No,] or Aate (b) iven T. 200c=(200 + 273) K 1073 K C1000+273k 1273K Tt000'c

of activatian, Ea265 K/mel 26 5 X103 Tmel 2650 J/mol t i do tind nale of oaction at Energy Ao0oc from Anshoniues egeuatin Baco Ea Ti 2 R T, T2 k are rale constnnts at 1000°c 1000 and 200°c R as 314 3/K/mol conslant n 12 73 1073 2650 -13 25 X10 1273 X1073 2.314 = 318.74 X o00015 2-5x 10-13 n k = 0.05 2.5X10 k1c00 Andilog (o 0s) 25 X1013 A

t000 = 1.12 2.5 XI0-13 -13 k1000 1.12 X 2 5 X10 -13 L/mol. sec = 2.8 X 10 rate smprasaian of Aeaction adl 4000'c is 2 -13 2:8 X10 L/mol, sae [No, hate