Acids heats of formation

Acid Heat of formation, kl / mol Flash point, °C Heat of combustion, kl / mof... 

Sulfate, NdjfSO j, pinkish needles prepd by heating the oxide with coned sulfuric acid. Heat of formation 57.2 keal. Sol in water heat of soln 36.5 keal. Is dec at 700-800. Forms several double salts. A penta-, an octa-, and a pen-tadecahydrate have been prepared. 

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