The document contains information about rate calculations for two chemical reactions. It provides the formulas used to calculate rates, defines relevant terms, and shows sample calculations for finding the rates of reactions involving the decomposition of NO2 and C4H9Cl. The rates were determined to be 0.0050 mol/l.s for the NO2 reaction and 0.0300 mol/l.s for the C4H9Cl reaction based on the changes in concentrations over specific time intervals.