The Molecular Heat and Entropy of Hydrogen Chloride Calculated From Band Spectra Data

Methods of summation are given for the Q-sum, and the related sums which are needed in calculating free energies, entropies and heat capacities from spectroscopic data. All necessary formulas are presented for the treatment of a linear molecule with arbitrary orbital angular momentum, spin multiplicity and nuclear symmetry. * Nineteen of the temperatures in this table are also used by Clayton and Giauque; comparison of the values of -(Fo-FoO) IT in the two tables shows exact agreement 14 times; the values of the present table are 0.001 lower four times, and 0.001 higher once.

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Heat

Awbery¹

1934

Rep. Prog. Phys.

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The purity and physical condition of the platinum of which the thermometer is made should be such that the ratio RJR0 shall not be less than 1.390 for t= 100' and 2.64 j for t = 4.4.4.6".From -190" to the ice point the temperature t is deduced from the resistance R, of a standard platinum resistance thermometer by means of the formula R,=R, ( I + A t + B t Z + C ( t -I o o ) t3). The constants R,, A and B are to be determined as specified above, and the additional constant C is determined by calibration at the oxygen point.The standard thermometer for use below 0 ' C. must in addition have a ratio RJR, less than 0 * 2 j o for t = -182.97'.From 660" C. to the gold point the temperature t is deduced from the electromotive force e of a standard platinum vus platinum-rhodium thermocouple, one junction of which is kept at a constant temperature of 0" C. while the other is at the temperature t defined by the formula e = a+ bt + ct2.

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The Molecular Heat and Entropy of Hydrogen Chloride Calculated From Band Spectra Data

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Mathematical Methods for Computing Thermodynamic Functions from Spectroscopic Data

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