interesting to note that if a structure in which the sodium is bridged to the iron in FeCl4_ through interaction with two chlorines is considered, the average energy for the six bonds in the same as the average of the eight Fe-Cl bonds in Fe2Cl6.The standard heat of formation of NaFeCl4(g) at 298°K., calculated using -60 ± 3 kcal. as AH0 for FeCls(g)6'12 and -98.2 kcal. for NaCl,16 is -154 ± 4 kcal. mole-1.
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