The stoichiometric equation for the reaction of nitric acid with oxygen is 2NO + O2 --> 2NO2. The following data was collected at 273°C.  If the concentration of oxygen is doubled while holding the concentration of NO constant, the rate will increase by a factor of __. Experiment [NO] [O2] Initial Rate (M/s) 1 0.020 0.010 0.0320 2 0.080 0.020 1.01 3 0.040 0.040 0.50 4 0.040 0.020 0.25 5 0.030 0.010 0.71

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