liquefied natural gas (LNG) is transported in very large tankers, stored as liquid in equilibrium with its vapor at approximately atmospheric pressure. If LNG is essentially pure methane, the storage temperature then is about 111.4 K, the normal boiling point of methane. The enormous amount of cold liquid can in principle serve as a heat sink for an on-board heat engine. Energy discarded to the LNG serves for its vaporization. If the heat source is ambient air at 300 K. and if the efficiency of a heal engine is 60% of its Carnot value, estimate the vaporization rate, in moles vaporized per kJ of power output.
For methane. ΔHlvn= 8.206 kJ mol-1.