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A 500 ml oxygen sample is collected over water at 4 degree celsius the total 750 mmHg.What will be the pressure of oxygen gas if it is dried.What volume will the dry gas occupied at STP?

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02/06/2008

to figure out the pressure of the dry gas, use this equation: Pgas= Ptotal - Pwatervapor ...(P means pressure) you need to find a conversion chart of 4 degrees celsius (into mm Hg/torr/atm) : http://dbhs.wvusd.k12.ca.us/webdocs/GasLaw/Vapor-Pressure-Data.html 4 degrees celsius = 0.81359 kPa ... convert to mm Hg by dividing by 101.325, then multiply by 760.0. 4 degrees celsius = 6.10mm Hg now plug into the problem above... Pgas= 750mm Hg - 6.10mm Hg = 743.9 mm Hg of dry oxygen gas ...that should be the correct answer, check with a chem teacher or something. ...I myself am trying to figure out how to solve the volume of dry gas at STP later to figure out the pressure of the dry gas, use this equation: Pgas= Ptotal - Pwatervapor ...(P means pressure) you need to find a conversion chart of 4 degrees celsius (into mm Hg/torr/atm) : http://dbhs.wvusd.k12.ca.us/webdocs/GasLaw/Vapor-Pressure-Data.html 4 degrees celsius = 0.81359 kPa ... convert to mm Hg by dividing by 101.325, then multiply by 760.0. 4 degrees celsius = 6.10mm Hg now plug into the problem above... Pgas= 750mm Hg - 6.10mm Hg = 743.9 mm Hg of dry oxygen gas ...that should be the correct answer, check with a chem teacher or something. ...I myself am trying to figure out how to solve the volume of dry gas at STP later