Sulfur dioxide, and only sulfur dioxide, is contained in a
stainless steel tank. The temperature and pressure inside the tank
can be adjusted to any desired values. What is the maximal number
of solid forms of sulfur dioxide that can exist inside the tank? If
liquid sulfur dioxide is present, how many solid forms can exist?
If instead of a liquid the vapor form of sulfur dioxide is present,
how many solid forms can exist? Finally, suppose both a vapor...