   # Place the following gases in order of increasing rms speed at 25 °C: Ar, CH 4 , N 2 , CH 2 F 2 . ### Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640

#### Solutions

Chapter
Section ### Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640
Chapter 10, Problem 45PS
Textbook Problem
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## Place the following gases in order of increasing rms speed at 25 °C: Ar, CH4, N2, CH2F2.

Interpretation Introduction

Interpretation: The given gases should be arranged in the order of increasing rms speed at given temperature.

Concept introduction:

The root mean square velocity μ is defined as the measure of velocity of particle in gas. It is the method to determine the single velocity value for particles.

Root mean square velocity can be determined,

μrms=(3RTM)1/2 (1)

(gas constant)R=8.314JKmolM=Molarmass

Molar mass: The molar mass of a substance is determined by dividing the given mass of substance by the amount of the substance.

### Explanation of Solution

The expression used to calculate the rms speed is as follows,

μrms=(3RTM)1/2

The rms speed for the CH2F2 molecule is

μrms=(3RTM)1/2=(3×8.314×2980.052)1/2=378.1m/s

The rms speed for the Ar molecule is

μrms=(3RTM)1/2=(3×8.314×2980.0399)1/2=431

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