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On the Calculation of Thermochemical Constants

Nature volume 81, page 37 (08 July 1909) | Download Citation



THERE are a number of physical properties of substances, e.g. molecular heat of combustion, refractivity, &c., which are chiefly additive in character, so that their values can be calculated if we know the fundamental constants. It is, however, also well known that these properties, while still remaining additive, involve factors depending on the constitution of the molecule, e.g. method of linking, ring-formation, &c., all of which should be taken into account in the calculation of the value of the particular property in the case of any given substance. It is the thorough-going application of this principle in the calculation of thermochemical constants, extended so as to include, not only the specific thermochemical values of double and triple bonds, but also the thermal value of the “strain” in ring-compounds and of the single bond in chain-compounds, that the book under review expounds. The author's method of calculation has already appeared in several articles published in the Chemical News, on which the present monograph is based.

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