Answer to Question #251629 in General Chemistry for Lilly

Question

Use the phase diagram to answer the following questions.
(a) What is the approximate value of the normal melting point? (b) Over what pressure range will solid neon sub lime? (c) At room temperature (T = 25 °C) can neon be liq uefied by compressing it?

Answer 1

The phase diagram of Neon is

Using the above diagram, we have

a.) The melting point is temperature which seperates the Liquid and Solid phase. The approximate Melting Point for Neon is 25 Kelvins.

b.) When anything solid turns into a gas without becoming liquid first, the process is called sublimation. In the case of Neon, it will sublime at pressure less than triple point pressure. (P = 0.43 atm).

c.) If we convert room temperature to kelvin, it will 298.16 K. Now, looking at the plot, Neon will only exist in supercritical fluid at the same temperature for any pressure increase. Hence, it is not possible to liquify Neon by compressing (increasing pressure) it at room temperature.