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A 10g sample of neon gas has 1700J of thermal energy. Estimate the average speed of a neon atom.

Short Answer

Expert verified

The average spped of a neon atom isvavg=580m/s

Step by step solution

01

Step :1 Introduction 

TThe gravitational potential between atoms is 0 in the micro system, and the total energy of a monatomic gas equals translational kinetic energy.. As a result, a monatomic gas's thermal energy is Natoms is given by equation (20.27in the form

Eth=Nϵavg

Where ϵavgis the average energy. The molecule with mass mand velocity vhas a translational kinetic energy on average The average translational kinetic energy of a molecule is affected by its temperature, hence it is related to the temperature per molecule in the form.

ϵavg=12mvavg2

Where KBis Boltzmann's constant and in SIunit its value is

kB=1.38×1023J/K

Knowing the mass Mand the molar mass m, we can get the number of molecules by

N=Mm

02

Step : 2 Explanation 

Use this expressions of Nand ϵavg into equation (1) to get an expression for vavg2

Eth=Nϵavg

=Mm12mvavg2

=12Mvavg2

03

Step :3 Substitution 

Solve equation

(3) for vavgand use the values forMand Eth

vavg=2EthM

=2(1700J)0.01kg

=580m/s

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