Dalton’s Law

The law of partial pressures based on the idea of multiple gases existing together within a container.

The volume and temperature of the container applies to all of the gases within the container but the number of moles has a direct influence on the pressure of each gas.

P_t = P₁ + P₂ + P₃ …

Practice problems of Dalton’s Law.

1. An air tank contains O₂ and N₂ at 0.5atm and 1.5atm respectively. What is the total pressure?
2. A diver’s tank contains 0.5mol O₂, 0.5mol N₂ and 0.1mol He. If the tank is at 298K and has a volume of 2L. What is the pressure of each gas? What is the total pressure?