A sample of gas is collected over water at a temperature of 27.0°C when the barometric pressure reading is 750.0 mm Hg. What is the partial pressure of the dry gas?

1 Answer
anor277
Jan 9, 2016

The partial pressure of the collected gas is #750# #mm# #Hg# LESS the saturated vapour pressure of water at #27.0# #""^@C#.

Explanation:

The saturated vapour pressure of water at #27.0# #""^@C# (#300# #K#) is approx. #28# #mm# #Hg#. The actual value should of course have been quoted with the problem. Thus the partial pressure of the gas is #750.0# #mm# #Hg# #-# #28# #mm# #Hg# #=# #722# #mm# #Hg#.

Again I could not find the correct value on the interwebs.

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