Question

TABLE 3-3 Cv Gas OR OR He Ne 1.6592.521.519 1.001 1.64 1.67 1.68 1.66 2.52 1.5091.008 Kr Xe H2 1.4103.422.4380.9995 0 3.52 2.5041.004 02 1.401 1.404 3.502.448 1.005 1.4043.50 2.4881.005 1.4003.52251.005 1.36 CO NO Cl2 4.12 3.021.09 1.3044.40 3.38 1.31 CO21 NH3 1.027 1.06 4.48 3.42 C4H1o0 1.0816.615.4 1.23

(The measured data were at temperature near room temperature.)

For monatomic molecules, f=3 (translational kinetic energy degrees of freedom)

so we can get Cv/R=f/2=1.5, Cp/R= (f+2)/2=2.5, r=(f+2)/2=1.67

The results agree with the experimental observation.

For monatomic molecules, f=7

we can get Cv/R=f/2=3.5, Cp/R= (f+2)/2=4.5, r=(f+2)/2=1.286

The results disagree with the experimental observation.

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I think that some energy modes (degree of freedom) were not fully excited at room temperature, if the temperature is high enough, the experimental value will getting closed

to theoretical value?

and what parameter will effect the value in different temperature?

Thanks!

Answer 1

The answer of the question is given on the fallowing page

aud hbe eh temperat uY a bove ihe The 1O. ats C fe edon e Teacher's Signature:

desreesare alko encited s/