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According to Dalton's Law of Partial Pressures, the pressure of oxygen in dry air would be

According to Dalton's Law of Partial Pressures, the pressure of oxygen in dry air-example-1
User Kwanza
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The pressure of the oxygen in the air is 0.21 atm. The partial pressure of a gas is the contribution that gas makes to the total pressure when the gas is part of a mixture.

User Chthonyx
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