i) You have decided to purchase a 500-gal tank of liquid propane (C3H8) to heat your house during the winter. You are concerned about tank rupture and the possibility of a vapor cloud explosion of all propane. Assume empirical explosion efficiency for propane is 5%. How far away (in ft ) must the tank be from the house to ensure that your house will receive only minor damage from an explosion? Show your calculations for equivalent mass of TNT assuming confined explosion. Use Figure 1 for correlation between scaled distance and explosion peak side-on overpressure. Figure 1: Correlation between scaled distance and explosion peak side -on overpressure for a TNT explosion occurring on a flat surface. (6 marks) ii) Estimate the limiting oxygen concentration (LOC) for propane. (4 marks) Data: The specific gravity of liquid propane is 0.500, and the energy of explosion for propane is 503.9kcal/g-mole; empirical explosion efficiency for propane is 5%; Minor damage to house structures correspondent overpressure is 4.8kPa or 0.7 psig