An accurate flo\y calorimeter, previously desc ribed , ha~ bee n used to m eas ure the heat capacity of gaseo us per(i uoropropane (C3Fs) at t hree p!"es~ures up to 1.5 atmospheres at each of the temperatures -30°, + 10°, + 50°, and + 90° C . The res ults, believed accurate to 0.1 p ercent, have been extrapolated to ze ro press ure at each te mperature, in order to obtain t he ideal-gas heat capacity (C~) a nd the press ure coefficient of heat capacity. Values of C~ are 31.10, 34.22, 37.02, and 39.49 calories m ole-1 deg ree C-I, r espectively, at t he four temperatures of measurement.
An accurate fiow calorime ter has bee n used to measure the heat capacity (C,,) of ga seou s hexafluol'Oethane (C,F 6) at -50°, -20°, + 10°, + 50°, and + 90° C a nd a t 0.5-, 1.0-, a nd loS-atmos phere press ure. The res ul ts a re believed to be acc urate to ± O.l pe rcen t.The values of C. " have been extrapola ted to zero press ure a t each tempe rat ure; the idea l-ga hea t capacities t hus obtained at t he fi ve tempe ratu res are, res pective ly, 20. 99, 22 .79, 24.43 , 26.45, and 28.24 ca lories mole-I degree-I. Calculated res ult s, using recent f re quency as 'ignments and molecu lar data, " 'ere 0.4 to 0.7 percen t hi gher t han t he experiment a l res ul ts.The values of t he press ure coefficient of heat capac ity at the fi ve temperature have been used in con jun ctio n \I'ith li te rature data to obtain an equat ion of s tate for hexafluoroe t han e at 10\\' press ures.
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