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The standard heat of formation of chlorine trifluoride (gas) at 298.15 K has been determined to be - 164.65 kj mol -1 (-39.35 kcal mol -1 ) with an overall experimental uncertainty of 5.14 kj mol -1 (1.23 kcal mol -1 ). This value is derived from the enthalpies of the following reactions which were measured directly in a flame calorimeter operated at 1 atm pressure and 303.5 K, together with data from previous investigations.ClF   3   (  g  )  +  2   H  2   (  g  )  +  100   H  2   O  (  1  )  →   [   HC  1  ⋅  3  HF  ⋅  100   H  2   O   ]   (  1  )(  1  /  2  )    Cl   2   (  g  )  +  1  /  2   H  2   (  g  )  +   [   3  HF  ⋅  100   H  2   O   ]   (  1  )  →   [   HC  1  ⋅  3  HF  ⋅  100   H  2   O   ]   (  1  )    The enthalpy of formation of [HC1‧100H 2 O](l) was also measured. The average Cl - F bond energy in chlorine trifluoride is calculated to be 160.1 kj mol -1 (38.26 kcal mol -1 ).

Fluorine flame calorimetry. III. The heat of formation of chlorine trifluoride at 298.15 K