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concentration of PAN in air

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.
If the initial concentration of PAN in an air sample is 5.9 x 10^14 molecules/L, what will be the concentration 1.05 h later? (in molecules/L)

Solution Summary

It finds the concentration of PAN in air after it dissociates accoring to the rate law of a first order reaction. The solution is detailed and has a '5/5' rating.