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Law of Partial Pressures

The total pressure of a mixture of gases is equal to the sum of the partial pressures of the constituent gases.
Let a mixture of non-reacting gases have n1 moles of the first gas, n2 moles of the second gas, and so on. Let the corresponding partial pressures be P1P2, …. The total pressure is given by
Ptotal = P1 + P2 + ……

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