Question

Iodine, like most substances, exhibits only three phases: solid, liquid, and vapor. The triple point of iodine is at 90 torr and 115^oC. Which of the following statements concerning liquid I₂ must be true? Explain your answer?

a) I₂(l) is denser than I₂(s)

b) I₂(l) cannot exist above 115^oC

c) I₂(l) cannot exist at 1 atmospheric pressure

d) I₂(l) cannot have a vapor pressure greater than 90 torr

e) I₂(l) cannot exist at a pressure of 10 torr