If oxygen gas is collected over water at 25 °C and 775 torr,what is the partial pressure of the O₂? The vapor pressure of water at 25 °C is 23.8 torr.

Question

Quizplus · Accepted Answer

The partial pressure of O₂ can be calculated using 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 the individual gases.

Ptotal = P(O₂) + P(H₂O)

We are given Ptotal = 775 torr and P(H₂O) = 23.8 torr. Substituting these values into the equation, we get:

775 torr = P(O₂) + 23.8 torr

Solving for P(O₂), we get:

P(O₂) = 751.2 torr

Therefore, the partial pressure of O₂ is 751 torr, which is closest to choice C (751 torr).

If Oxygen Gas Is Collected Over Water at 25 °C