Problem 11.56

The normal melting and boiling points of O2 are -218 degrees C and -183 degrees C, repsectively. Its triple point is at -219 degrees C and 1.14 torr, and its critical point is at -119 degrees C and 49.8 atm.

(a) Sketch the phase diagram for O2, showing the four points given above and indicating the area in which each phase is stable.

Try sketching the phase diagram yourself; check your result here

(b) Will O2(s) float on O2(l)? Explain.

From the phase diagram in part (a), the solid-liquid line is normal (slopes to the right). Thus, O2(s) is more dense than O2(l), and as a result will not float.

(c)As it is heated, will solid O2 sublime or melt under a pressure of 1 atm?

If the solid is at constant pressure of 1 atm (760 torr), it will melt when heated.

If you have any questions or comments, reply to chapman@sou.edu
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Doug Chapman chapman@sou.edu 7/1/08