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2nd Edition

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Publisher: Wadsworth Cengage Learning,

ISBN: 9781133958437

Chapter 19, Problem 19.12E

Textbook Problem

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Interstellar space can be considered as having
**(a)** the pressure of hydrogen in interstellar space and **(b)** the average speed of the hydrogen atoms. Compare these answers with values under normal Earth conditions.

Interpretation Introduction

**(a)**

**Interpretation:**

The pressure of hydrogen in interstellar space is to be calculated.

**Concept introduction:**

The pressure of a gas is calculated by the formula,

Where,

•

•

•

The pressure of a gas is calculated by the formula,

Where,

•

•

•

The average energy of the atoms is calculated by the formula,

Where,

•

•

•

The number of moles is calculated by the formula,

The number of atoms present in

The number of atoms present in

Substitute the number of atoms present in

The value of universal gas constant is

Substitute the value of number of moles, universal gas constant, and temperature in equation (2).

Interpretation Introduction

**(b)**

**Interpretation:**

The average speed of hydrogen atoms is to be calculated.

**Concept introduction:**

A gas is made up of atoms or molecules that move with very high speeds. The kinetic energy of gases is very high. Every molecule or atom present in a gas can have a different energy. Therefore, root mean square speed, most probable velocity, and mean velocity are calculated for a gas.

Physical Chemistry

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