[ChEngy]

I can't wrap my brain around this for some reason! 

In a He-Ne laser tube, the ratio of He-Ne atoms is 7:1. Total pressure is ~1 torr. Temperature is 22*C. What are the concentrations of He and Ne atoms?

I've been trying to use P_He=(N_He/N_A)x(RT/V), but no matter what I do, the P_He makes no sense.

Any help would be greatly appreciated.

[sjb]

I can't wrap my brain around this for some reason! 

In a He-Ne laser tube, the ratio of He-Ne atoms is 7:1. Total pressure is ~1 torr. Temperature is 22*C. What are the concentrations of He and Ne atoms?

I've been trying to use P_He=(N_He/N_A)x(RT/V), but no matter what I do, the P_He makes no sense.

Any help would be greatly appreciated.

The pressure of the mix is equal to the sum of the partial pressures of the components