The Triple Point of CO₂ Is at 5

Multiple Choice

The triple point of CO₂ is at 5.2 atm and -57°C. Under atmospheric conditions present in a typical Boulder, Colorado, laboratory (P = 630 torr, T = 23° C) , solid CO₂ will

A) remain solid.
B) melt.
C) boil.
D) sublime.
E) none of these