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Answer :
The pressure of the collected hydrogen gas is 695.2 mmHg, determined by subtracting the vapor pressure of water at the given temperature from the total pressure measured.
When a gas is collected over water, the total pressure is the sum of the partial pressures of the gas and the water vapor. This is described by Dalton's Law.
To determine the pressure of the hydrogen gas alone, we need to subtract the vapor pressure of water at the given temperature from the total pressure.
The vapor pressure of water at 22°C is typically 19.8 mmHg.
Therefore, we can find the partial pressure of hydrogen gas as follows:
- Total pressure measured: 715 mmHg
- Vapor pressure of water at 22°C: 19.8 mmHg
- Partial pressure of hydrogen gas = Total pressure - Vapor pressure of water
- Partial pressure of hydrogen gas = 715 mmHg - 19.8 mmHg
- Partial pressure of hydrogen gas = 695.2 mmHg
Thus, the pressure of the collected hydrogen gas is 695.2 mmHg.
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Answer:
Pressure of hydrogen gas = 695.2 mmHg
Explanation:
Given:
Water temperature = 22°C
Pressure inside the tube = 715 mmHg
Find:
Pressure of hydrogen gas
Computation:
Using vapor pressure of water table
Water pressure at 22°C = 19.8 mmHg
Pressure inside the tube = Pressure of hydrogen gas + Water pressure at 22°C
715 = Pressure of hydrogen gas + 19.8
Pressure of hydrogen gas = 715 - 19.8
Pressure of hydrogen gas = 695.2 mmHg
