Question

A substance has a triple point at −24.5 ∘C and 225 mmHg. What is most likely to happen to a solid sample of the substance as it is warmed from −35 ∘C to 5 ∘C at a pressure of 210 mmHg?

Nothing (the solid will remain as a solid).
The solid will sublime into a gas.
The solid will melt into a liquid.

Answer 1

Solid will sublime into a gas.

Step-by-step explanation:

Triple point is a temperature where the three states of a substance coexist.

If the pressure is lower than the triple point, the substance does not exist as a liquid, so it is impossible that solid melts, or that the solid remains as a solid.

Liquid state is not stable.