Every day, underground volcanoes deep beneath Antarctica convert some of the two-mile thick ice sheets into steam. What is the temperature of a steam vent on the surface of Antarctica? You can assume that the steam generated by the volcanoes is initially at 1000°C and 300 atm, the surface pressure of Antarctica is 1 atm, and the vent behaves like a prefect valve, with no heat transfer and no shaft work. You can assume that the heat capacity of steam is 32 J/mol K.