H2MoleculePropEPSolnME501F2011

H2MoleculePropEPSolnME501F2011 - ME 501: Thermodynamic...

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ME 501: Thermodynamic Properties for Diatomic Molecules Example Problem 2 One kmol of diatomic hydrogen (H 2 ) is contained in a rigid pressure vessel with volume  100 m 3 . The initial temperature is T 1 200 K . Heat is added to the system until the temperature is raised to 2 4000 TK . Assume that H 2 does not dissociate to any significant extent even at 4000 K . Characteristic temperatures for H 2 : vib K 6345 , rot K 87 6 . Consider the following electronic energy level: Level 0 [g 0 =1, ( 0 /hc) = 0 cm -1 ] Assume that the H 2 is an ideal gas, a rigid rotator, and a harmonic oscillator. Calculate the entropy change 21 SS in J / K  of the H 2 contained in the pressure vessel during the heat addition process (Answer: 67.57 kJ/K ). Specify the contribution to the entropy change for each of the energy modes.
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I also used an Excel spreadsheet to solve this problem. The calculation of accurate thermodynamic data requires more terms in the rotational and vibrational term energy expressions.
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H2MoleculePropEPSolnME501F2011 - ME 501: Thermodynamic...

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