Question

In a gas mixture, the partial pressures are nitrogen $425Torr$, oxygen $115Torr$, and helium $225Torr$. What is the total pressure, in Torr, exerted by the gas mixture?

Short answer

The total pressure is $765Torr$.

Step-by-step solution

Given Information

We need to find the total pressure.

Simplify

In a gas, mixture, each gas exerts its partial pressure, which is the pressure it would exert if it were the gas in the container. Dalton's law that the total pressure of a gas mixture is the sum of the partial pressures of the gases in the mixture.

Total pressure is:

Nitrogen is$P_{nit}=425Torr$

Oxygen is$P_{oxy}=115Torr$

Helium is $P_{helium}=225Torr$

localid="1652623807311" role="math" $$\begin{gathered} P_{total}=p_{nit}+P_{oxy}+P_{helium} \\ =425+115+225 \\ =765Torr \end{gathered}$$