Heat Capacity op 373.42 G. (*/2 Mole) of Gd2(S04)3-8H20 Value of calorie taken equals 4.185 absolute joules 7'av., °K.Cp/Va mole in cal./deg." ., °K.Cp/1/ mole in cal./deg.
Values given by Garner and Abernethy (Table II), with one exception, indicate a rather regular rate of decrease in the amount of heat given off with the introduction of each successive nitro group into the ring. In no one of the several series covered by the writer (Table I) was this found to be true, the entrance of the second nitro group in each case causing the liberation of less heat than the third. This is contrary to both theory and observed fact and is ascribable to variation in the errors in determining heats of combustion, small variations in the percentage of error causing much larger variations in derived values. This would indicate that the new determinations of heats of combustion reported in this paper are probably low to the extent of 0.7%. Summary 1. The heats of combustion of twenty-one compounds have been determined, no values for fourteen of these having been previously published. From these, heats of formation and of nitration have been calculated.2. Study of the values determined and calculated indicate that those determined have a probable error of -0.7%. Dover, New Jersey
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