Posted by Anonymous on Tuesday, May 22, 2012 at 9:51pm.
Use (P1V1/T1) = (P2V2/T2)
For P1 use 99.3 kPa - kPa for water pressure at 20.0 C. Most tables list vapor pressure H2O in mm Hg so I would convert 99.3 kPa to mm Hg first. Vapor pressure vs T for H2O should be in tables in your text or notes. (perhaps in the problem.)
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