njit-etd1961-002 - New Jersey Institute of Technology

6(P) The entropies of evaporation from -10°C. tothe critical point were obtained by dividingthe latent heats of vaporization in (I) by thecorresponding temperatures.(Q) The entropy of the saturated vapor S SV at1 atmosphere and -19 ° C. was evaluated by addingthe entropy of evaporation to the entropy of thesaturated liquid at -19°C.(R) The molal entropy of the ideal gas S* 3 at-19°C. was obtained by adding to SSV the entropycorrection (S*3 - Ssv) from Table 47 of Watsonand et al. 3(S) The values of ideal entropy from -10°C. to400°C. at the constant pressure of 1 atm. wereevaluated by adding to S*3 the valueT2 T1 P dT.T1 T(T) The entropies of the saturated vapor from-10 °C. to the critical point were obtained byfirst making a pressure correction for idealbehavior, and then making a correction for lack ofideality. Thus S*5 = S*4 R in (P5/P1), and theentropy of the saturated vapor is obtained bysubtracting (S*5 - S5) from values given in Table47 of Watson and et al. 3(U) The values of entropy in the superheated regionfrom -10°C. to 400°C. and from ² to 150 atmosphereswere evaluated in the same manner as in (N),except Table 5² of Watson and et al. 6 was usedinstead of Table 50.