SOLUTION TO EXERCISE 17


The diagram should look sort of like this:
    
    |                    The critical point is labeled "X" and is 
    |                    where the temperature is 647 K and pressure
    |          X         of 260 atm.
    |  \      /
    |   \  L /           The triple point, where the three branches
  p |    \  /            of the diagram meet, is at 273 K and 0.006 atm.
  r |   S \/  
  e |     /  G           The slope of the line between solid and liquid
  s |    /               must be negative, since the solid floats on the
  s |   /                liquid.  The other two branches have positive
  u |  /                 slope. 
  r | /                  
  e |/                   
    -----------------    
       temperature