A flask of hydrogen gas is collected at 1.023 atm and 35 degrees C by displacement of water at 35 degrees C is 42.2 mm Hg. What is the partial pressure of hydrogen gas in the flask?
Not exactly sure where to start with this question, or what formula to use.
Thanks in advance
Dalton's Law of Partial Pressure.
Ptotal = 1.023 atm from problem.
pH2O = 42.2 mm Hg from problem.
Depending upon how the answer is to be displayed (mm Hg or atm),convert one of the above into the other unit and use Dalton's law.
Ptotla = pH2 + pH2O
You know Ptotal and pH2O, solve for pH2.
Don't let all of that extraneous information confuse you.
To find the partial pressure of hydrogen gas in the flask, we need to use Dalton's Law of Partial Pressures. According to Dalton's Law, the total pressure of a mixture of gases is equal to the sum of the partial pressures of the individual gases.
In this case, we have two gases: hydrogen gas (H2) and water vapor (H2O). The partial pressure of hydrogen gas can be determined by subtracting the partial pressure of water vapor from the total pressure.
To calculate the partial pressure of hydrogen gas, we can follow these steps:
Step 1: Convert the given temperature from Celsius to Kelvin.
The formula to convert from Celsius to Kelvin is: K = °C + 273.15
Given: temperature = 35°C
Converting to Kelvin: temperature = 35°C + 273.15 = 308.15 K
Step 2: Convert the given pressure values to the same units.
Given: total pressure = 1.023 atm
Given: partial pressure of water vapor = 42.2 mmHg
We need to convert the partial pressure of water vapor from mmHg to atm since the total pressure is given in atm. The conversion factor is 1 atm = 760 mmHg.
Partial pressure of water vapor (in atm) = 42.2 mmHg * (1 atm / 760 mmHg)
Partial pressure of water vapor (in atm) ≈ 0.0555263 atm
Step 3: Calculate the partial pressure of hydrogen gas.
Partial pressure of hydrogen gas = Total pressure - Partial pressure of water vapor
Partial pressure of hydrogen gas = 1.023 atm - 0.0555263 atm
To get the final answer, subtract the partial pressure of water vapor from the total pressure:
Partial pressure of hydrogen gas ≈ 0.9674737 atm
Therefore, the partial pressure of hydrogen gas in the flask is approximately 0.9674737 atm.