Show that the water vapor in atmospheric air does not significantly influence the change in enthalpy if air with water vapor undergoes a temperature change from 20 8C to 400 8C at constant pressure. Consider atmospheric air to be composed of 22.5% oxygen, 76% nitrogen, and 1.5% water vapor (all by mass). Compare the results to air with Cp 5 1.0 kJ/kg? K and R5 0.287 kJ/kg? K. Calculate the error in ∆ h if the water vapor is ignored.