A system of physical chemistry - Index of

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A system of physical chemistry - Index of

MOLECULAR HEATS OF POLYATOMIC SOLIDS 77

where F^ and F.2 are the Debye

/8V2^

C„=F,(^)^F,(^^)

and Einstein functions or atomic heat

expressions respectively.

In the case of KCl, ^v^ =166 (obtained from the melting-point

formula), and ^v^ = 2i3"5 (obtained directly from the Reststrahlen

observations). The following table, taken from Nernst's Theory of the

Solid State, gives the values of the Einstein and Debye portions of the

molecular heat in the case of KCl. The column headed "correction"

contains the quantities which must be added to 2C1, in order to give

2(Zp, the molecular heat at constant pressure :—

T.

KCl.y8v2 = 213-5; ^y\ = 166.

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