4. [Crowl 6-13] Liquid heptane is stored in a 100,000-L storage vessel that is vented directly to air. The heptane is stored at 25°C and latm pressure. The liquid is

drained from the storage vessel and all that remains in the vessel is the air saturated with heptane vapor. a) Is the vapor in the storage vessel flammable? b) What is the TNT equivalent for the vapor remaining in the vessel? c) If the vapor explodes, what is the overpressure 50m from the vessel? d) What damage can be expected at 50m?