The normal boiling point, melting point, and physical state at a given pressure and temperature of a substance are to be determined. Concept introduction: A phase diagram is a graph that represents the solid, liquid, and gaseous phases of a substance at different pressures and temperatures. The lines are the boundaries between two phases and represent the conditions under which the two phases are in equilibrium. At triple point, the three-phase boundaries meet each other. The temperature at which a substance changes to vapor phase from a liquid phase at 1 atm is the normal boiling point. The temperature at which a substance changes to liquid phase from a solid phase at 1 atm is known as the normal melting point.

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Chapter 11.8, Problem 1PPA

Interpretation Introduction

Interpretation: The normal boiling point, melting point, and physical state at a given pressure and temperature of a substance are to be determined.

Concept introduction:

A phase diagram is a graph that represents the solid, liquid, and gaseous phases of a substance at different pressures and temperatures.

The lines are the boundaries between two phases and represent the conditions under which the two phases are in equilibrium.

At triple point, the three-phase boundaries meet each other.

The temperature at which a substance changes to vapor phase from a liquid phase at 1 atm

is the normal boiling point.

The temperature at which a substance changes to liquid phase from a solid phase at 1 atm

is known as the normal melting point.

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