I just now came up with 0.02192 ounces of condensate water per cubic foot by using this chart... http://www.process-heating.com/ext/resources/PH/2001/05/Files/PDFs/0501PHhartzell-tables1and2.pdf
where I took the water content of 90F 80%RH air and subtracted water content of 40F 100%RH air.
Not sure if correct, yet, double checking it...
Not for schoolwork, just a 62 yr ol frt with projects.