# A 2.01-L sample of O2(g) was collected over water at a total pressure of 785 torr and 25°C. When the O2(g) was dried (water vapor removed), the gas has a volume of 1.92 L at 25°C and 785 torr. How would you calculate the vapor pressure of water at 25°C?

##### 1 Answer

Nov 3, 2015

#### Explanation:

At constant number of mole

We should calculate the pressure of pure

In the original mixture, the total pressure