6 . 99 TABLE 6.10: DATA USED IN THE PRODUCTION OF THE PSYCHROMETRIC CHART Molar mass of 50% N2 - 50% 02 atmosphere Mole fraction of 02 present, xo2 . 5 Mole fraction of N2 present, XN2 . 5 Mass fraction of 02 present, MF02 . 5333 Mass fraction of 02 present, MFN2 .4667 30g Coefficient of specific heat at constant pressure CP = .23 Btu/lbm- 0 R N202 Coefficient of specific heat at constant volume Cv = .17 Btu/lbm- 0 R N202 From equs. in Thermodynamics, K. Wails, McGraw-Hill Book Co., 1966, Chapter 11. Atmosphere treated as nonreactive ideal-gas mixture.
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