Add time:08/04/2019         Source:sciencedirect.com

The energy of combustion of iodine in fluorine was measured in a bomb calorimeter and the standard enthalpy of formation of liquid iodine pentafluoride, ΔHfo(IF5, 1, 298·15 K), was calculated to be −(210·81 ± 0·39) kcal/mole. The combustion products contained variable quantities of gaseous iodine heptafluoride (IF7) in addition to IF5. A linear least squares analysis of the standard energy of combustion of iodine as a function of the ratio of IF7 to IF5 enabled a value of −(229·80 ± 0·54) kcal/mole to be deduced for ΔHfo(IF7, g, 298·15 K).

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