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Answer :
The partial pressure of the hydrogen gas collected over water at 24°C is approximately 97,700 Pa.
We move ahead to solve this question by using the principles of partial pressures in Physical chemistry, with the main one being Dalton's Law of partial pressures.
Partial pressure is defined as the pressure which a component of a mixture of volume V would exert if it individually occupied the same total volume.
Dalton's Law provides an excellent relation to calculate the partial pressures of any component of a mixture.
- The total pressure offered by a mixture is the sum of the partial pressures of all its components.
- Partial Pressure of a component = Mole Fraction of the component * Total pressure of the mixture
In this question, the partial pressure of Hydrogen gas in water is equal to the difference between the Total pressure and the pressure of plain water at that temperature, by applying Dalton's Law.
Vapor pressure of Water at 24°C = 22.0 mmHg
We need them in different units, so we convert them.
1 mmHg ≈ 133.32Pa
Thus,
Vapor Pressure = 22 * 133.32
= 2933.04 Pa = 2.933 kPa
We already have the total pressure given as 100.6kPa.
Therefore, the partial pressure of Hâ‚‚ gas is
P.P = Total pressure - Vapor Pressure
P.P = 100.6 - 2.933
Partial Pressure = 97.66kPa ≈ 97700 Pa
So, the partial pressure of Hâ‚‚ gas, in this case, is 97700 Pa.
For more on Partial Pressures, visit
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