41. A sample of gas is collected over water at a temperature of 35.0 degrees C. When the barometric pressure reading is 742.0 torr. What is the partial pressure of the dry gas?
2007-11-08 12:48:24 · 2 answers · asked by loveme 1 in Science & Mathematics ➔ Chemistry
The pressure of the gas sample over water is comprised of 2 components; the pressure of the gas and the vapor pressure of water @ 35.0 C. You need to look up this vapor pressure, then you can subtract it from the total to determine the actual gas pressure. They probably have the table of vapor pressure of water vs temperature in your chemistry book; maybe in the back.
My reference says 42.175torr @ 35.0 C for water.
2007-11-08 13:09:29 · answer #1 · answered by Flying Dragon 7 · 1⤊ 0⤋
The vapor pressure of water at 35.0C is 42.2 torr.
742.0 - 42.2 torr = 699.8 torr
2007-11-08 13:01:33 · answer #2 · answered by steve_geo1 7 · 0⤊ 0⤋