Liquid butane, C4H10, is stored in cylinders to be used as a fuel. The normal boiling point of butane is listed as - 0.5 oC.
(a) Suppose the tank is standing in the sun and reaches a temperature of 35 oC. Would you expect the pressure in the tank to be greater or less than atmospheric pressure? How does the pressure within the tank depend on how much liquid butane is in it?
(b) Suppose the valve to the tank is opened and a few liters of butane are allowed to escape rapidly. What do you expect would happen to the temperature of the remaining liquid butane in the tank? Explain.
(c) How much heat must be added to vaporize 250 g of butane if its heat of vaporization is 21.3 kj? What volume does this much butane occupy at 755 torr and 35 oC?