The minimum volume % of vapor that gives a combustible mix is called the lower flammable limit (LFL). Generally, the LFL is about half the stoichiometric mixture, the concentration required for complete combustion of the vapor in air. a.) If oxygen is 20.9% volume % of air, estimate the LFL for n-hexane, C6H14. b.) What volume (mL) of liquid n-hexane (d=0.660 g/cm^3) is required to produce a flammable mixture of hexane in 1.000 m^3 of air at STP?