The phase diagram of a substance is shown below. (a)...

The phase diagram of a substance is shown below. (a) Approximately what is the normal boiling point and what is the normal melting point of the substance? (b) What is the physical state of the substance under the following conditions? (i) $T=150 \mathrm{K}, P=0.5 \mathrm{atm}$ (ii) $T=325 \mathrm{K}, P=0.9 \mathrm{atm}$ (iii) $T=450 \mathrm{K}, P=265 \mathrm{atm}$

The phase diagram of a substance is shown below.
(a) Approximately what is the normal boiling point and what is the normal melting point of the substance?
(b) What is the physical state of the substance under the following conditions?
(i) $T=150 \mathrm{K}, P=0.5 \mathrm{atm}$
(ii) $T=325 \mathrm{K}, P=0.9 \mathrm{atm}$
(iii) $T=450 \mathrm{K}, P=265 \mathrm{atm}$

Key Concepts

Pressure-Temperature Relationship

This concept describes how pressure and temperature interact to determine the physical state of a substance. In a phase diagram, the boundaries between phases are set by the specific combinations of pressure and temperature at which the phases coexist in equilibrium.

Phase Transitions

Phase transitions refer to the changes between different states of matter, such as solid to liquid (melting) or liquid to gas (boiling). These transitions occur at specific temperature and pressure conditions, which are determined by the equilibrium lines on a phase diagram.

Phase Diagram

A phase diagram is a graphical tool that maps the state of a substance (solid, liquid, gas) as functions of temperature and pressure. It illustrates the regions where each phase is stable and includes lines or curves that represent the equilibrium conditions between different phases.

Normal Boiling Point

The normal boiling point is the temperature at which a liquid turns into a gas at a standard pressure of 1 atmosphere. It is a key property used to compare volatile liquids and understand their vaporization behavior under standard conditions.

Normal Melting Point

The normal melting point is the temperature at which a solid becomes a liquid at 1 atmosphere of pressure. This property is fundamental for characterizing materials and predicting their behavior near the solid-liquid phase boundary.

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