A safety concern in an industrial installation requires that a pressure relief valve must be designed to rupture and release ammonia vapor (molar mass = 0.017kg/mol) at conditions of 2MPa and 323K into a surge tank. Thermodynamic data indicates that the compressibility factor at the relieving (rupturing) conditions is 0.06m^3/kg. . (i) Calculate at the rupturing conditions and determine whether attractive or repulsive forces dominate. (ii) If the tank's total volume is 5m^3, how many moles (or kg) of ammonia was present in the tank before the valve ruptures and the content is spilled?