A worker was welding on an empty acetone drum to attach casters to make a shop cart. The drum was rinsed with water and inverted and the worker began welding. It was estimated that the equivalent of one tablespoon of acetone remained trapped in the crevices of the drum. The welding flame broke through the bottom of the inverted drum and there was an explosion killing the welder. It is important that chemical engineers have an understanding of what the accident was, why it happened and how it could have been prevented in order ensure similar accidents may be prevented. The lesson learned from this incident is that one tablespoon of a flammable liquid combined with heat and a spark source is sufficient to kill someone. Hot work should not be done on or near flammable liquid containers, even if they have been rinsed with water. Empty flammable liquid containers must be disposed of properly according to manufacturer's guidelines and not reused. (Question 1) Assuming the equivalent of 1 tablespoon of acetone was left on the sides of the inverted 44-gallon drum, calculate the concentration (in mole%) of acetone in vapor space of the inverted drum. Assume T = 300 K. Question 2) The Lower flammability limit (LFL) for acetone is 2.5 mole% and the Upper flammability limit (UFL) is 13 mole%. Assume any liquid acetone that evaporates spreads uniformly throughout the tank. Is it possible for the average gas-phase composition in the tank to be within the explosive limits at any time? Explain. (Question 3) Calculate the energy released (in grams of TNT equivalent) from a tablespoon of acetone, given that the molar enthalpy of TNT is - 3410 kJ/mol. (Question 4) Assume the inverted 44-gallon drum was fully saturated with acetone at T = 300 K. Calculate the concentration in mole% of acetone in the vapor space of the inverted drum. Could the drum combust? Explain