Chapter 21, Problem 10STP

Interpretation Introduction

Interpretation:

The state of matter which is located at a temperature of $-80°\text{C}$ and pressure of 10 atm in following graph should be determined.

Concept introduction:

When energy or heat is gain or lost by any matter, the matter changes its state to form a state of matter.

State of matter is classified as:

1. Solid
2. Liquid
3. Gas

A graphical diagram which represents the physical states of a substance under different values of temperature and pressure is known as phase diagram.

The general representation of phase diagram is:

Answer to Problem 10STP

The state of matter which is located at a temperature of $-80°\text{C}$ and pressure of 10 atm is solid state.

Explanation of Solution

The given graph is:

Graph can be redrawn as:

Now,

When the temperature is $-80°\mathrm{C}$ and the pressure is 10 atm, then the substance belongs to the area A as labeled in graph.

Compare the below general graph with the above graph:

On comparing both graphs with each other, one can observe that the labeled area A represents solid state.