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The Phase Diagram

Phase Diagram

A phase diagram is a graphical representation of the change of matter from one phase (solid, liquid, gas) to another.

Consider compounds Ma and Mb.

The properties of Ma are as follows:
Melting pt. = 00C at normal conditions, 1 atm (101325Pa)
Boiling pt. = 1000C at normal conditions, 1 atm(101325Pa)
Critical Temperature = 3740C, at 218 atm
Triple pt. =0.00980C, at 0.006 atm (611Pa)

The properties of Mb are as follows:
Melting pt. = -78.50C at normal conditions, 1 atm (101,325Pa)
Boiling pt. = -570C at normal conditions, 1 atm (101,325Pa)
Critical Temperature = 31.10C, at 7.39MPa
Triple pt. =-56.60C, at 518kPa

(a) Determine the identity of Ma and Mb and sketch their respective phase diagrams
(b) What is the implication of the triple point pressure of Mb being above 1 atm?

The strings:

S7P5A51 (Change - Physical Change)

The math:
Pj Problem of Interest is of type change (Physical - Change).

(a) Compound Ma is water (H2O). The following is its phase diagram:
Phase Diagram of Water

Compound Mb is carbon dioxide (CO2)

Phase Diagram of Carbon Dioxide

(b) Liquid carbon dioxide does not exist at 1atm pressure. So, the triple point pressure of carbon dioxide has to be above 1 atm in order for all three phases to exist in equilibrium.


The point . is a mathematical abstraction. It has negligible size and a great sense of position. Consequently, it is front and center in abstract existential reasoning.
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