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The standard heat of formation of aluminum fluoride was calculated from the heats of combustion of Teflon and of aluminum-Teflon mixtures in fluorine. The heat measurements were made in a bomb calorimeter. (1)C  2    F  4   (   solid polymer   )  +  2   F  2   (  g  )  =  2    CF   4   (  g  )    (2)    Al  (  c  )  +  3  /  2   F  2   (  g  )  =    AlF   3   (  c  )    For reaction (1),  Δ   H  298  °   was found equal to -10,350.7 ±0.4 Jg -1 (- 247.43 ±0.01 kcal monomole -1 ), and for reaction (2)  Δ   H  298  °   =  Δ   H   f  298   °   was calculated to be -1507.8 ±1.2 kJ mole -1 (- 360.37 ±0.29 kcal mole -1 ). The latter uncertainties are the computed standard deviations of the means. The calculated standard heat of formation of aluminum fluoride is estimated to be accurate to within ±6.6 kJ mole -1 (1.6 kcal mole -1 ). The measurements on Teflon were combined with existing data and the heat of formation of carbon tetra-fluoride was calculated to be -221.8 kcal mole -1 .

Heat of formation of aluminum fluoride by direct combination of the elements