TVA data for the heats of solution of the respective calcium compounds and for the heats of formation and dilution of phosphoric acid; (b) published data for the heats of formation4 of Ca++, PO43-and F-, for the entropies4 of Ca++ F~, Ca(s), F2(g) and 02(g), for the entropy6 of PO43-(-52 ± 2 e.u.), and for the entropy7 of fluorapatite.
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