What mass of water vapor is present in a dormitory room when the relative humidity is 55% and the temperature is 23°C? The dimensions of the room are 4.5 m² floor area and 3.5 m ceiling height. (See Study Question 93 for a definition of relative humidity and Appendix G for the vapor pressure of water.)

Data given in Question 93

Relative humidity is the ratio of the partial pressure of water in air at a given temperature to the vapor pressure of water at that temperature. Calculate the mass of water per liter of air under the following conditions.