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# Application of Dalton’s law

Calculating the partial pressure of gases, if the total pressure is given. at a fixed temperature.

Application of Dalton’s law

In a reaction involving the collection of gas by downward displacement of water, the pressure of dry vapor collected can be calculated using Dalton’s law.

Pdry gas collected  = ptotal - pwater vapour

pwater vapour is generally referred as aqueous tension and its values are available

for air at various temperatures.

Let us understand Dalton's law by solving this problem. A mixture of gases contains 4.76 mole of Ne, 0.74 mole of Ar and 2.5 mole of Xe. Calculate the partial pressure of gases, if the total pressure is 2 atm. at a fixed temperature.

Solution: PNe = xNe PTotal = 0.595 × 2

= 1.19 atm.

PAr = xAr PTotal = 0.093 × 2

= 0.186 atm.

PXe = xXe PTotal = 0.312 × 2

= 0.624 atm.

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