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An ideal gas has molecules with 5 degrees of freedom. The ratio of specific heats at constant pressure (Cp) and at constant volume (Cv) is:
  • a)
    6
  • b)
  • c)
  • d)
Correct answer is option 'B'. Can you explain this answer?
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Most Upvoted Answer
An ideal gas has molecules with 5 degrees of freedom. The ratio of spe...
Degree of freedom=5
Cv=5/2R
we know that Cp= Cv+R
                      Cp=5/2R +R
                       Cp = 7/2 R
                 Cp/Cv = 7/5 
Correct answer is D) 7/5
PLEASE NOTE THAT 
the 
heat capacity ratio 
is the 
ratio
 of the 
heat capacity at constant pressure
 (C
P
) to 
heat capacity at constant volume
 (C
V
). We can find it by dividing Cp with Cv..
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For certain substances such as ammonium chloride, nitrogen peroxide, phosphorus pentachloride, etc. the measured densities are found to be less than those calculatedfrom their molecular formula. The observed densities decrease towards a limit as thetemperature is raised. This is due to the splitting of the molecules into simpler ones. The process is reversible and is called thermal dissociation.Examples :With increase in the number of molecules, the volume increases (pressure remaining constant) and, in consequence, the density decreases. As the temperature rises, more and more dissociation takes place, and when practically complete dissociation occursthe density reaches its lowest limit.The extent of issociation, ice., the fraction of the total number of molecules which suffers dissociation is called the degree of dissociation. Gas density measurements can be used to determine the degree of dissociation. Let us take by general case where one molecule of a substance A splits up into n molecule of B on heating; i.e.,t = 0 at = teq a x nx Total no. of moles Observed molecular weight or molar mass of the mixtureQ.If the total mass of the mixture in the above case is 300 gm, the moles at C(g) present are.

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An ideal gas has molecules with 5 degrees of freedom. The ratio of specific heats at constant pressure (Cp) and at constantvolume (Cv) is:a)6b)c)d)Correct answer is option 'B'. Can you explain this answer?
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