Question

In a gas mixture of He, Ne, and Ar with a total pressure of 8.40 atm, the mole fraction of Ar is ____ if the partial pressures of He and Ne are 1.50 and 2.00 atm, respectively

Answer 1

I'll attach my work okai ?

Answer 2

Thank you!

Answer 3

\[P _{total } = P _{Ne}+P _{He}+P _{Ar}\]
Since we know the partial pressures of Helium and neum plus the total pressure we can find the partial pressure of Argon right?
\[P _{Ar} = P _{total }- (P _{He }+ P _{Ne})\]
So u find it.
We know:
\[P _{Ar} = X _{Ar} * P _{total}\]In this equation we know the total pressure and the partial pressure of Argon so we can easily find the mole fraction.
\[X _{Ar} = \frac{ P _{Ar} }{ P _{total} }\]

Answer 4

Hope u got it !! :)