You are called in to investigate an accident in which an old above-ground tank cracked and spilled 1000 L (equivalent to 1 m') of gasoline onto the surrounding soil. Upon your arrival two hours after the accident you notice that the spill has spread out to cover a square area of flot ground of dimensions 5.3 mx 53 m and that the surface of the soil has aliquid layer of gasoline remaining. There is concern about the gasoline getting into the groundwater of the city. Your job is to evaluate how much gasoline remains 2 hours after the spill by subtracting the amount that has volatilized. The temperature of the ground air, and gasoline is 300K (-27C). The wind speed parallel to the surfnce is about 2 m/s. You can treat gasoline as a single species with a vapor pressure of 0.1 atm at 300K and atmospheric pressure of I atm. The diffusivity of gasoline in air is 1 x 10-5 m2 Gasoline's molar mass is 85 gr/mol and its liquid density is 730.000 gm/m'. In solving the problem, you may assume that the gasoline spread to a 5.3 mx 53 m square rapidly and reaches steady-state volatilization rapidly. Nes kg Note: Rg = 8.205 x 10-5 m'att mol. and m 9 = 9.807 $2 and MW air and = 28.97 gm mol m2 Part A) (15 pts) By comparing the Grand Re show me whether free convection, forced convection or both are important (circle one) and briefly explain why (one sentence or less)? Part B) (3 pts) The spill happened at the bottom of flat small valley and covers the entire valley (5.3 mx 5.3 m). Think about the figure below showing the valley, densities, and mountains on the sides. Based on this figure and your thoughts, Circle whether there is or isn't free convection. Justify your answer (1 sentence) Free Convection or No Free Convection pers Justification: Part C continued on next page! Ps Part C) (16 pts) Now determine the total amount of gasoline left on and in the ground 2 hours after the spill assuming steady-state convection from the surface. Circle your answer.