One mole of CO2 at 1 atm and 300K is expanded adiabatically. When CO2 gas has cooled down to 79C, it will condense into dry ice. A) How many degrees-of-freedom does a molecule of CO2 have? Describe the physical motions that the degrees-of-freedom correspond to. B) Assuming that CO2 is an ideal gas, find the minimum final gas volume needed before dry ice can be formed. C) Find U,Q, and W during the expansion