What is the partial pressure of oxygen collected over water if the temperature is 20.0°C and the total gas pressure is 735 mmHg?

Question

77077 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2015-11-22T00:30:42

$"718 mmHg"$

The trick here is to realize that the oxygen, which is collected over water, will be mixed with water vapor.

This means that the *total pressure8 of the mixture will have two components

the partial pressure of oxygen

the vapor pressure of water at $20.0^@"C"$

The vapor pressure of water at that temperature is approximately $"14.47 mmHg"$

This means that you will have

$P_"total" = P_"oxygen" + P_"water"$

$P_"oxygen" = "735 mmHg" - "17.47 mmHg" = color(green)("718 mmHg")$