1.

Given below are observations on molar specific heats at room temperature of some common gases. {:("Gas","Molar specific heat "(C_(v))),(,("cal mol"^(1)K^(-1))),("Hydrogen",4.87),("Nitrogen",4.97),("Oxygen",5.02),("Nitric oxide",4.99),("Carbon monoxide",5.01),("Chlorine",6.17):} The measured molar specific heats of these gases are markedly different from those for monatomic gases. Typically, molar specific heat of a monatomie gas is 2.52 cal/mol K. Explain this difference. What can you infer from the somewhat larger than the rest) value for chlorine ?

Answer» <html><body><p></p><a href="https://interviewquestions.tuteehub.com/tag/solution-25781" style="font-weight:bold;" target="_blank" title="Click to know more about SOLUTION">SOLUTION</a> :The gases are diatomic, and have other degrees of freedom fic, have other <a href="https://interviewquestions.tuteehub.com/tag/modes-1099915" style="font-weight:bold;" target="_blank" title="Click to know more about MODES">MODES</a> of motion) possible besides the translational degrees of freedom. To raise the temperature of the gas by a certain amount, heat is to be <a href="https://interviewquestions.tuteehub.com/tag/supplied-3090548" style="font-weight:bold;" target="_blank" title="Click to know more about SUPPLIED">SUPPLIED</a> to increase the average energy of all the modes Consequently, molar specific heat of diatomic gases is more than that of monatomie gases. It can be shown that if only rotational modes of motion are <a href="https://interviewquestions.tuteehub.com/tag/considered-7257760" style="font-weight:bold;" target="_blank" title="Click to know more about CONSIDERED">CONSIDERED</a>, the molar specific heat of diatomic gases is nearly (5/2) R which agrees with the observations for all the gases <a href="https://interviewquestions.tuteehub.com/tag/listed-7694003" style="font-weight:bold;" target="_blank" title="Click to know more about LISTED">LISTED</a> in the table, except chlorine. The higher value of molar specific heat of chlorine indicates that besides rotational modes, vibrational modes are also present in chlorine at room temperature.</body></html>


Discussion

No Comment Found

Related InterviewSolutions