Be sure to answer all parts. One of the compounds used to increase the octane rating of gasoline is toluene (pictured). Suppose 1.25 mL of toluene (d = 0.867 g/mL) is consumed when a sample of gasoline burns in air. a (a) How many grams of oxygen are needed for complete combustion of the toluene? 1.69 g (b) How many total moles of gaseous products form? mol (c) How many molecules of water vapor form? 2.81 x 10 22 molecules (Enter your answer in scientific notation.)