Answer to Question #327976 in General Chemistry for Tesha

Question

Based from the phase diagram of water and carbon dioxide, answer the following

questions and justify your answers:

1. You have ice at 263 K (-10.0 °C) and 1.0 atm. What could you do to make

the ice sublime?

2. A sample of dry ice (solid CO2) is cooled to 173 K (-100.0 °C), and is set

on a table at room temperature (298 K; 25 °C). At what temperature is the

rate of sublimation and deposition the same (assume that pressure is held

constant at 1 atm)?

Answer 1

1. Any solid may be sublimed if its temperature and pressure are below its triple point. For example, if you were to freeze water into ice and cool it further and then reduce the pressure, you could get ice to sublime.

2. Sublimation is the process of going from a solid to a gas without going through the liquid phase. Deposition is the opposite process. The temperature at which these processes occur at 1 atm pressure is 194.65 K.