Gasoline (which can be considered to be octane, C₈H₁₈) burns in oxygen to produce carbon dioxide and water. What volume (L) of oxygen at STP is necessary to react with 1.0 gal of gasoline
(The density of gasoline is 0.81 g/mL. 1 gal = 3.78 L)

Question

Quizplus · Accepted Answer

First, convert 1.0 gal of gasoline to liters (1 gal = 3.78 L), then to milliliters (1 L = 1000 mL), and use the density to find the mass in grams. Calculate moles of octane using its molar mass (114.22 g/mol). The balanced equation for combustion of octane is 2 C8H18 + 25 O2 → 16 CO2 + 18 H2O, showing that 2 moles of octane require 25 moles of O2. Use stoichiometry to find moles of O2 needed, then convert to volume at STP (1 mole = 22.4 L).

Gasoline (Which Can Be Considered to Be Octane, C8H18) Burns

Gasoline (Which Can Be Considered to Be Octane, C₈H₁₈) Burns