The oxygen gas emitted from an aquatic plant during photosynthesis is collected over water at a temperature of 25 C and a total pressure of 760 torr . what is the partial pressure of the gas?
how do i know the water vapor pressure at 25C though?
To find the partial pressure of the gas, we need to use Dalton's Law of Partial Pressures, which states that the total pressure of a mixture of gases is equal to the sum of the partial pressures of each gas.
In this case, we know that the total pressure is 760 torr and the gas of interest is oxygen.
To determine the partial pressure of oxygen, we need to subtract the vapor pressure of water at 25°C from the total pressure, as the oxygen gas is collected over water.
The vapor pressure of water at 25°C is approximately 23.8 torr.
Therefore, the partial pressure of the oxygen gas can be calculated as:
Partial pressure of oxygen = Total pressure - Vapor pressure of water
Partial pressure of oxygen = 760 torr - 23.8 torr
Partial pressure of oxygen = 736.2 torr
So, the partial pressure of the oxygen gas is 736.2 torr.
from the total pressure, I would subtract the water vapor pressure (at 25C) to get the partial pressure of O2.
Partial pressure O2 + watervapor =760torr