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?

Question

Not exactly sure where to start with this question, or what formula to use.
Thanks in advance

Answer 1

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.