Question

The oxygen gas emitted from an aquatic plant during photosynthesis is collected over water at a temperature of 25 degrees Celcius and a total pressure of 752 torr. What is the partial pressure of the oxygen gas?

Answer 1

you need to find the pressure for water vapor for certain temperatures. this is given in a table and have been calculated for you.

use the dalton's law of Partial pressure. i.e. the Pressure for the dry gas equals the Total pressure of the system - the pressure of water vapor for that temperature.

hope that helps.