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 PO2 + PH2O = Ptotal = 711 torr
To calculate the partial pressure of O2, we need to consider the vapor pressure of water at the given temperature.
The total pressure in the collection setup is the sum of the partial pressures of O2 gas and water vapor. According to Dalton's law of partial pressures, the partial pressure of O2 can be determined by subtracting the vapor pressure of water from the total pressure.
The partial pressure of O2 = Total pressure - Vapor pressure of water
Given:
Total pressure = 711 torr
Vapor pressure of water = 21.2 torr
Substituting the values into the equation:
Partial pressure of O2 = 711 torr - 21.2 torr
Partial pressure of O2 = 689.8 torr
Therefore, the partial pressure of O2 is 689.8 torr.