How is partial pressure related to mole fraction?
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The sum of the mole fractions of all the components present must equal 1. That is, the partial pressure of any gas in a mixture is the total pressure multiplied by the mole fraction of that gas. ... This means that 78% of the particles present in the atmosphere are N2; hence the mole fraction of N2 is 78%/100% = 0.78.
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