## anonymous one year ago 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

1. Rushwr

I'll attach my work okai ?

2. anonymous

Thank you!

3. Rushwr

$P _{total } = P _{Ne}+P _{He}+P _{Ar}$ 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. $X _{Ar} = \frac{ P _{Ar} }{ P _{total} }$

4. Rushwr

Hope u got it !! :)