2. One of the reactions that lead to the formation of acid rain is that between

Question

2. One of the reactions that lead to the formation of acid rain is that between oxygen and nitrogen monoxide in the process of industrial production of nitric acid: 02(g) + 2N0(g)- 2NO2(g) And the reaction proceeds at a rate Rate = HO:"NO" From the following experimental data a. Estimate the reaction order with respect to each of the reactants and overall. b. Calculate reaction rate constant, k, and specify its units. Initial Reactant Initial Rate (mol/L·s) Concentrations (mol/L) Experiment [o2] 1.10x10-2 2.20x10-2 1.10x10-2 3.30x10 1.10x10-2 INO] 3.21×10-3 6.40x10- 12.8× 10-3 9.60x10-3 28.8× 10-3 1 .30× 10-2 1.30x10-2 3.90x 1-2

Explanation / Answer

Ans 2

Rate law

r = k [O2]m [NO]n

Part a

From exp 1 and 3

r1/r3 =[O2]1m [NO]1n / [O2]3m [NO]3n

3.21/12.8 = (1.3/2.6)n

0.25 = 0.5n

0.52 = 0.5n

n = 2

From exp 1 and 2

r1/r2 =[O2]1m [NO]1n / [O2]2m [NO]2n

3.21/6.40 = (1.1/2.2)m

0.5 = 0.5m

m = 1

Rate law for this reaction

r = k [O2] [NO]2

Order with respect to O2 = 1

Order with respect to NO = 2

Overall order = 3

Part b

From exp 1

k = r1 / [O2]1 [NO]12

= (3.21*10^-3)/(1.1*10^-2*1.3*10^-2*1.3*10^-2)

= 1726.73 M-2 s-1

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