Answer to Question #78768 in General Chemistry for nina

Question

What is the partial pressure of helium gas in a sealed vessel that has a total pressure of 205 kPa and partial pressures of 15 kPa for chlorine and 89 kPa for fluorine?

Answer 1

The total pressure is the sum of the partial pressures.

Dalton's law of partial pressures states that in a gaseous mixture, the partial pressure of a gaseous component is the same as the pressure that gas would exert if it alone occupied the container.

The total pressure is the sum of the individual partial pressures.

Ptotal = Pfluorine + Pchlorine + Phelium

205kPa = 89kPa + 15kPa + Phelium

Phelium = (205 – 89 – 15)kPa = 101kPa