The partial pressure of the oxygen in the sample of oxygen gas collected over water is 360.2 torr.
According to Dalton's law of partial pressure, the total pressure of a mixture of gases is the sum of partial pressures of all the gases in the mixture. From Dalton's law;
PT = P1 + P2 + P3 + ..........
The partial pressure of water at 30∘C is 31.8 torr, Hence;
Total pressure = Partial pressure of oxygen + Vapor pressure of water
Total pressure = 392 torr
Partial pressure of oxygen = Total pressure - Vapor pressure of water
Partial pressure of oxygen = 392 torr - 31.8 torr = 360.2 torr
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