The following diagrams represent mixtures of NO (g) and O2 (g). These two substances react as follows: 2 NO (g) + O2 (g) → 2 NO2 (g) It has been determined experimentally that the rate is second order in NO and first order O2. Based on this fact, which of the following mixtures will have the fastest initial rate? a) The mixture (1). b) The mixture (2). c) The mixture (3).