only 6.6% of the total entropy for CaO • B203 and is lower for the other substances.The entropies of 3Ca0-B203, 2Ca0-B203, and Ca0-B203 differ, in order, by 9.2 and 9.6 units, corresponding to successive decreases of one mole of calcium oxide. These figures are to be compared with the measured value for free calcium oxide,10 ¿^g81 e = 9.5 =*= 0.2. This type of approximate additivity of entropies of some interoxidic compounds has been noted previously in work of this Laboratory and is the result of compensation of plus and minus deviations from additivity of heat capacities. In the case of CaO• 2B203 such compensation is quite incomplete and the entropy difference between Ca0-2B203 and CaO • B203 is only 7.1 units, whereas the entropy of crystalline boric oxide11 is S^g.ie = 13.0 =*= 0.1.Related Thermal Data.-Free energies of formation at 298.16°K. of the four calcium borates from the oxides and from the elements are given in energy accompany each successive step of adding one mole of oxide to CaO • B203 to form the other calcium borates. Summary Low temperature heat capacity measurements of 3CaO • B203, 2CaO • B203, CaO • B203, and CaO • 2B203 were made throughout the temperature range 52°to 298.16°K.The entropies of the four calcium borates were determined as 43.9 =*= 0.3, 34.7 =*= 0.2, 25.1 =t 0.2', and 32.2 =*= 0.3 cal./deg./mole, respectively. Free energy of formation values from the oxides and from the elements are included.
substance p-aminosuccinanilic acid, and have found by hapten-inhibition experiments that the antibodies in the serum combine more strongly with /-N-(a-methylbenzyl) -succinamic acid than with the d isomer.Experimental Methods Protein Antigens.-The immunizing antigen was prepared by diazotizing 0.006 mole of ^-aminosuccinanilie acid and coupling with 100 ml. of sheep serum at pH 9.
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