Question

Please answer #3 and #4 only

Photochemical Smog Photochemical smog is a type of air pollution produced when sunlight acts upon motor vehicle exhaust gases, such as nitrogen oxides (e.g., NO, NO:) to form harmful substances such as ozone (0). These substances participate in a reaction cycle that determines the concentration of pollutants at different times during the day. Ozone Formation: NO:(), is formed by chemical reactions involving N2(g) and O-() at the high temperatures inside internal combustion engines in our cars. In the presence of sunlight, NO.(E) reacts with O(g) to generate Oxfg) as described by the following overall reaction: NO2(g) + Oxg) = NO(g) + O3(g) = 306.5 kJ/mol =107/mol This chemical process occurs in two steps, as illustrated in the potential energy diagram. In the second step of the process, the radical species o formed in the first step reacts with O. O + NO NO+0 1. Write the chemical equations for each reaction step and determine the molecularity of each of them. Identify all reaction intermediates. NO Reaction Path 2. Express the rate law for each reaction step and derive the rate law for the overall process. 3. Estimate how many times faster this reaction is at 30°C versus 10°C. 4. Based on the information provided, evaluate whether this process can be expected to occur to a large extent at 25°C (Hint: Express K, for the process and calculate its value) Substance Spl/mol K) O2(g) 161.1 0.18) 238.9 211.2 NO(g) NO (8) 240.1

Answer 1

NO₂ - O + NO Slowa O+ NO + O NO+O₃ (Past) ③ Ace to arrhenius Ea ki 2.303R log (R2) = 103 (1) 10g (lon) 306.5 2.303X 8.314X10 303) 283 303 3.73 Raa Antilog (3.73) = 5:48103 5400 Ri R₂ =54ooki : Rate will increases 5400 times ① An = (Ealg - Ealb 171.52 = -2.303x8.314X10-3 An°= 306.5-107=) 199.5 KS +298 × log Kp mole log Kp =-30.06 NO2 +022 NO + O2 Kp = Antilog (-30.06) As={Sp-{SR >(211.2 + 238.9)-(240-1 +161-1) As the value of kp is very AS = 93.9 J/molk Small . Hence this reaction AG=ANO - TASO is not occur to the large AC°= 199.5-298193.9x10-3) extent AG = 171.52K J Reactant is more stable At equilibrium AG=0 not proceed to much in AG = - 2.303 RT log Kp 2.303 RT log kp forward direction Kp = 8.7 x 10-31