Determination of the Enthalpy of the Fructose Mutarotation by Reaction Calorimety.

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Abstract
The molar enthalpy of formation of beta-fructofuranose from beta-fructopyranose was measured to be 2950 cal. The calorimeter used was of the adiabatic type, in which the temperature of the reaction mixture was sensed by a thermistor and recorded. The sensitivity of about 25 mV/degree C corresponds to roughly 40 cal/mV, and reaction heats of the order of 200 cal were conveniently determined with an overall accuracy of 3% using a 5 mV recorder.

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