31.5 grams of cl2 is collected over water at 35 c. the volume of the chlorine is 15.0 l when the water levels are equal. what is the barometric pressure? (pressure should be in torr.)

Given:

mass of chlorine = 31.5 grams Cl2 
temperature of water = 35 degrees C
volume of chlorine = 15 L

*water levels are equal
assume ideal gas behavior

Vapor pressure of water at 35 C = 42.2 torr

To solve for the barometric pressure, use the ideal gas equation:

PV = nRT

where P = Pgas - Pwater

(Pgas - 42.2 torr) * 15 L = 31.5g/70.9g/mol * (35 + 273) K * (760 torr * 22.4 L/298K)

solve for Pgas

Pgas = 563.36 torr

Therefore, the barometric pressure is 563.36 torr.  

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