# A gaseous mixture of helium and neon at 1*atm contains a partial pressure of 0.60*atm with respect to helium. What is P_"Ne"?

Mar 24, 2017

${P}_{\text{Ne"=P_"Total"-P_"He}} = 0.40 \cdot a t m \ldots \ldots . .$

#### Explanation:

Dalton's law of partial pressures holds that in the gaseous mixture, the partial pressure exerted by a component is the same as the pressure as it would exert if it ALONE occupied the container. The total pressure is the sum of the individual partial pressures.

And thus ${P}_{\text{Total"=P_"He"+P_"Ne}}$. We are given ${P}_{\text{Total}}$ and ${P}_{\text{He}}$; it is thus fairly straightforward to get ${P}_{\text{Ne}}$ by difference.

For a more general treatment, see here.

Capisce?