The south pole is the coldest region in the world. The lowest recorded temperature in Antarctica is about -90C. This is cold enough for many common substances to freeze. We want to consider if gases in the air, such as carbon dioxide, could freeze at this temperature. 

pound per square inch (psi) - 6.895 kPa 6.8951/ 0.06805 atm a) Label the triple and critical points on the graph.  

b) Identify the phase of CO2 present at -90C and 1 atm.  

 

c) Calculate the amount of heat (in J) that needs to be lost to take 1 mole of CO2 from STP to the phase described in part b.  Hint: 4. amount of heat - n AH + mass.CAT These data may be helpful AHvap - 16.7 kJ/mol, Asub - 26.0 kJ/mol, Coen -0.82 J/g*K, molar mass of CO2 - 44 g/mol. d) The south pole is actually at an elevation of 9000 ft, with a pressure of 10.5 psi, and the mole fraction of CO2 is 0.00033 What is the partial pressure of CO2?