Question

4. A 250 mL sample of oxygen gas is collected by water displacement. As a result, the oxygen is saturated with water vapor. The partial pressure of water vapor at the prevailing temperature is 22 torr. Calculate the partial pressure of the oxygen if the total pressure of the sample is 720 torr.

Answer 1

Answer: The partial pressure of the oxygen is 698 torr

Step-by-step explanation:

According to Dalton's law, the total pressure is the sum of individual pressures.

`p_(total)=p_A+p_B`

Given :
`p_(total)` =total pressure of gases = 720 torr

`p_(O_2)` = partial pressure of
`O_2` = ?

`p_(H_2O)` = partial pressure of
`H_2O` = 22 torr

`p_(total)=p_(O_2)+p_(H_2O)`

`720=p_(O_2)+22`

`p_(O_2)=698torr`

Thus the partial pressure of the oxygen is 698 torr