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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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Most popular questions from this chapter

On earth, STP is based on the average atmospheric pressure at the surface and on a phase change of water that occurs at an easily produced temperature, being only slightly cooler than the average air temperature. The atmosphere of Venus is almost entirely carbon dioxide CO2, the pressure at the surface is a staggering 93atm, and the average temperature is localid="1648638013375" 470°C. Venusian scientists, if they existed, would certainly use the surface pressure as part of their definition of STP. To complete the definition, they would seek a phase change that occurs near the average temperature. Conveniently, the melting point of the element tellurium is localid="1648638019185" 450°C. What are (a) the rms speed and (b) the mean free path of carbon dioxide molecules at Venusian STP based on this phase change in tellurium? The radius of a CO2molecule islocalid="1648638027654" 1.5×10-10m.

A gas of 1.0×1020atoms or molecules has 1.0J of thermal energy. Its molar specific heat at constant pressure is 20.8J/molK. What is the temperature of the gas?

A rigid container holds 0.20gof hydrogen gas. How much heat is needed to change the temperature of the gas

a.From50K torole="math" localid="1648534484983" 100K?

b.From localid="1648534491176" 250Kto localid="1648534494324" 300K?

c.From localid="1648534497013" 2250Kto localid="1648534500972" 2300K?

A cylinder contains gas at a pressure of 2.0atmand a number density of4.2×1025m-3. The rms speed of the atoms is 660m/s. Identify the gas.

Gases, in contrast with solids and liquids, are very compressible. What can you infer from this observation about the microscopic nature of gases?

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