A sample of O2 gas was collected over water at 23ºC and 711 torr. What is the partial pressure of the O2? (The vapor pressure of water at 23ºC is 21.2 torr.)
Partial pressure of O2:_______torr
Remember Dalton's Law.
Ptotal = PO2 + PH2O
To find the partial pressure of O2, we need to subtract the vapor pressure of water from the total pressure.
The total pressure is given as 711 torr, and the vapor pressure of water at 23ºC is 21.2 torr.
Therefore, the partial pressure of O2 can be calculated as follows:
Partial pressure of O2 = Total pressure - Vapor pressure of water
Partial pressure of O2 = 711 torr - 21.2 torr
Partial pressure of O2 = 689.8 torr
So, the partial pressure of O2 is 689.8 torr.