Isooctane, C₈H₁₈, is the component of gasoline from which the term octane rating derives. (b) Assuming that gasoline is 100% isooctane, that isooctane burns to produce only CO₂ and H₂O, and that the density of isooctane is 0.792 g/mL, what mass of CO₂ in kilograms is produced each year by the annual U.S. gasoline consumption of 4.6⨉10¹⁰ L?