Hey I only want some help to solve the first question: problem 7.1 (a)

Ch.07 Thermodynamic Properties of Moist Air.pdf Textbook . Opdateret 19. aug. 2023 af Zoltan Nagy SOURCE: Reprinted by permission from Trans. ASHVE 55, 463. where x,, is the mole fraction of the water vapor in the mixture and x,,, is the mole frac- tion of water vapor at saturation for the same temperature and pressure as those of the actual state. We may convert Eq. (7.5) to the forms 0.622 1+- WS 0.622 + WS b = 0.622 0.622 + W (7.6) 1+ W It is important to observe that neither u nor o are defined when the temperature of moist air exceeds the saturation temperature of pure water corresponding to the moist air pressure. For sea-level pressure, W, approaches infinity at 212 OF (100 .C). Thus for 14.696 w psia (101.325 kPa), u and o are undefined for temperatures higher than 212 F (100 .C). Three moist-air properties are associated with temperature. The dry-bulb tempera- ture, t, is the true temperature of moist air at rest. The dew-point temperature, a, is defined as the solution ta (P, W) of the equation W, (P, ta) = W (7.7)