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From the measured heat of hydrolysis of KWF, in alkaline hypochlorite (-123.6 f 2.6 kcal mol-l), the heat of formation of KWF,, the electron affinity of WF,, and the fluoride ion affinity of WF, are estimated to be -541 -f 3, 120 f 5, and 145 f 6 kcal mol-l respectively, at 25". electron affinities of PtF, (156), IrF, (135), OsF, (108) and Rep, (90 kcal mol-l), but so far these have not been confirmed quantitatively.The hydrolysis of W F ' , , by alkaline hypochlorite occufs quantitatively according to equation (1). KwF,(s) $-+ocl-(aq) + 70H-(aq) --fFEW electron affinities of compounds have been reported. K+(as) From the reactions of transition metal hexafluorides with oxidisable molecules such as O,, NO, and NO,, Bartlettl has made qualitative estimates of the minimum values of the A frangible glass bulb, containing a known mass of the compound, was broken into a solution of sodium hydroxide

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