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Dalton’s Law of Partial Pressure

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Dalton’s Law of Partial Pressure

Dalton’s Law

• All gases behave pretty much the same.

• Observe more than one gas in a sample.

• If 2 or more gases are mixed in a container, each gas will exert a pressure

PARTIAL PRESSURE

• Total pressure = sum of partial pressures

Dalton’s Law

• PTOT = PA + PB + PC

• Patm = PO2 + PN2 + PCO2 + PAr

Dalton’s Law

• A sample relationship exists between the total pressure and individual partial pressures MOLE FRACTION

Dalton’s LawDef:

Mole Fraction = mols of one substance = Xtotal moles

(XA + XB +XC =1)

Partial Pressure = pressure exerted by only one gas in a mixture.

PA = nART/V or PA = XAPTOT

Dalton’s Law

• Gases are often collected over water, hence the need for partial pressures.

• PTOT = PGAS + PH20 VAPOR

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