Problem 1 Dry air has the following composition: 02 Name Symbol % (vol) Nitrogen N2 78.084 Oxygen 20.9476 Argon Ar 0.934 Carbon Dioxide CO2 0.0314 Neon Ne 0.001818 Methane CH4 0.0002 Helium He 0.000524 Krypton Kr 0.000114 Hydrogen H2 0.00005 Xenon Xe 0.0000087 I a) Calculate the average molecular weight of air. b) An air stream at 24C and 760 Tor (total pressure) contains 22.8 Torr of water (partial pressure). Calcu- late the average molecular weight of the humid air. c) Calculate the density of humid air in kg/m2 and lb/ft? Additional information: Air at the conditions of the problem may be considered an ideal gas, that is, the partial pressure P, of componenti in the mixture is RT Pirm V where R is the ideal-gas constant, T is absolute temperature, is the number of moles of component i and V is the volume of the mixture