The smog constituent peroxyacetyl nitrate (PAN) dissociates into peroxyacetyl radicals and NO2(g) in a first order reaction with a half- life of 32 min. CH;COONO, (3) CH3COO • (g) + NO2(g) PAN Peroxyacetyl radical (a) What is the value of the rate constant? (b) If the initial concentration of PAN in an air sample is 2.7x1015 molecules/L, what will be the concentration 2.24 h later?

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