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Dalton's Law of Partial Pressures, or Dalton's Law, states that the total pressure of a gas in a container is the sum of the partial pressures of the individual gases in the container. Here is a worked example problem showing how to use Dalton's Law to calculate the pressure of a gas.
Ptot = nRT/V = [(1.578)(0.08206)(273)]/(10.0) = 3.53 atm. Another way we can use Daltonâs Law of Partial Pressures is to calculate the partial pressure of any gas in a mixture if we know the total pressure and the number of moles of each gas (and vice versa).