✦ LIBER ✦

Design and testing of a hybrid of isoperibol and phase-change calorimeters for measurements of the enthalpies of reactions requiring prolonged heating

✍ Scribed by E.G. Lavut; N.V. Chelovskaya

Publisher: Elsevier Science
Year: 1995
Tongue: English
Weight: 286 KB
Volume: 27
Category: Article
ISSN: 0021-9614
DOI: 10.1006/jcht.1995.0143

No coin nor oath required. For personal study only.

✦ Synopsis

A hybrid of isoperibol and phase-change bomb calorimeters with gallium as melting body was developed. This calorimeter allows one to raise the temperature of the reagents in the bomb to about 1100 K during (45 to 50) min. The procedure of calibration of the calorimetric system is described; the molar enthalpy of melting of gallium which was measured in the calibration process was found: (5584.720.5) J•mol -1 . The molar enthalpy of the reaction: Na2C2O4 + 0.5O2 = Na2CO3+CO2, was measured for testing the new system. The molar enthalpy of formation of Na2C2O4 calculated: -(1322.321.0) kJ•mol -1 , agrees with the value: -(1322.321.4) kJ•mol -1 , obtained by solution calorimetry.

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