I am try to calibrate an MQ-3 sensor with and Arduino board. However, I need a little help with thermodynamics, I am using a container of alcohol which has a volume of 591.470 mL, only 100mL is filled with 100 proof (50%) alcohol. However I need to calibrate the sensor to the content of alcohol in air the container. I need a thermodynamic relation of how much ethanol is saturated in the air when it is fully saturated at room temperature (23C) (assuming 100% dry air). Density of ethanol is 0.789 g/cm^3. How can I mathematically calculate how much alcohol is in the air??? I am familiar with thermodynamic steam saturation tables, yet I have not seen any refrencing ethanol. Any help with a formula that I can implement???