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A mixture of three gases (N2, Ar, and O2) at 2.6 atm is found to contain 23% N2 and 3.0% Ar by mass. What is the partial pressure of O2

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Eduard22sly

Given that the mixture of the three gases has a pressure of 2.6 atm, the partial pressure of O₂ is 1.924 atm

Dalton's law of partial pressure

This law states that at contact temperature, the total pressure of a mixture of gases is equal to the sum of the partial pressure exerted by each gas. Mathematically, it is expressed as

Total pressure = partial pressure of A + partial pressure of B

How to determine the partial pressure of O₂

  • Percentage of N₂ = 23%
  • Percentage of Ar = 3%
  • Percentage of O₂ = 100 – (23 + 3) = 74%
  • Total pressure = 2.6 atm
  • Partial pressure of O₂ =?

Partial pressure of O₂ = (percentage of O₂) × total pressure

Partial pressure of O₂ = 74% × 2.6

Partial pressure of O₂ = 0.74 × 2.6

Partial pressure of O₂ = 1.924 atm

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