A total of 0.829 L of hydrogen gas is collected over water at 33.0°C. The total pressure is 794 torr.

If the vapor pressure of water at 33.0°C is 13.2 torr, what is the partial pressure of hydrogen?

P (H₂) = 807.2 torr

Explanation:

According to the Dalton law, the pressure of mixture of a gas is sum of the partial pressure of its mixing component gases.

P (total) = P1 + P2 + P3 + ...

In given problem,

Total pressure is = 794 torr

Partial pressure of water = 13.2 torr

Partial pressure of hydrogen = ?

Solution:

P (total) = P (H₂O) + P (H₂)

P (H₂) = P (total) - P (H₂O)

P (H₂) = 794 torr - 13.2 torr

P (H₂) = 807.2 torr