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Published byKylie Fitzpatrick Modified over 3 years ago

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Daltons Law P total = P 1 + P 2 + P 3 +...

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Daltons Law The pressure of each component is called the partial pressure of that component.

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Daltons Law For example: If we have a flask containing nitrogen gas, whose partial pressure is.78 atm and oxygen gas, whose partial pressure is.20 atm, the total pressure in the flask is P total = P N2 + P O2 P total =.78 +.20 =.98 atm

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Daltons Law Another way to think about this is through the use of the mole fraction. The mole fraction is rather like calculating the percent of each component.

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Daltons Law The mole fraction is written as follows a N2 = moles N 2 total moles total moles This is basically the percent (by number) of some element.

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Daltons Law We can rearrange Daltons Law to use the mole fraction as follows: P x = a x (P total ) Or specifically: P N2 = a N2 (P total )

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Daltons Law For example: ordinary air contains 78.084% nitrogen. We might be interested in knowing what the partial pressure of nitrogen is in the atmosphere.

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Daltons Law The mole fraction of N 2 must be.78084, so P N2 =.78084(P total ) If the atmospheric pressure is 640 torr, P N2 =.78084(640) = 500 torr

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Composition of Air 78.084%Nitrogen 20.948%Oxygen.934%Argon.0315%Carbon dioxide.001818%Neon.000524%Helium.000114%Krypton.0000087%Xenon

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