posted by leah .
A closed container with a mixture of hydrogen, helium, and argon has a total pressure of 2.90 atm. The partial pressure of hydrogen is 0.500 atm and the partial pressure of argon is 760. mm Hg. What is the partial pressure of helium?
Ptotal = PH2 + PAr + PHe
One unknown, solve for that.
Note: you will need to convert sole of the units. All must be in the same unit.I would change A to atm si nce everything else is in atm. atm = mm Hg/760 mm Hg.