The pressure of the collected gas is 762.9 mmHg
According to Dalton's law of partial pressures, an ideal gas's partial pressure—or pi—in a mixture of ideal gases is equal to the pressure the gas would experience if it were the only thing in the combination's volume and temperature.
The most frequent occurrence of Dalton's law of partial pressures is when a gas is captured by displacing water. The sum of the partial pressure of the gas itself plus the vapor pressure of water at that temperature determines the overall pressure that a wet gas exerts.
Given Data:
The gaseous mixture's total pressure (P) i= 784 mmHg.
Water vapour partial pressure (pH2O) = 21.1 mmHg
Partially collected gas pressure (pGas) = ?
Calculation of the gas collected partial pressure:
The gas collected and the water vapor combined have the same total pressure as the gaseous mixture.
P = pH₂O + pGas
pGas = P - pH₂O
pGas = 784 mmHg - 21.1 mmHg = 762.9 mmHg
Therefore, the Pressure of collected gas = 762.9 mmHg
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