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Entropy of Cyclopentane 341 sum £(333/ ) + 2£(494/ ) + 2£(1058/ ), which fits the data over the entire experimental range of temperature. In both instances only the Debye function is of importance in the extrapolation of entropy. Table II Entropies at 298.16°K. (cal./dbg. mol.) MgaSiO* MgSiOs 0-50.12°K. (extrap.) 0.60 0.49

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It has been possible to crystallize butene-1 for the first time and thus obtain thermal data on the crystal down to 11.5°K. leading to entropies of crystal, liquid and gas. In addition, it has been possible to cool the glass down to 13°K. and obtain a value for the residual entropy in the glass at the absolute zero.The present paper records the experimental data and conclusions from this work. ExperimentalPurification of Butene-1 Samples.-The sample of butene-1 on which the heat capacities in series I-VIII and the heats of fusion were measured was obtained from Professor M. R. Fenske, of the Petroleum Refining Labora-

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