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Partial pressure of gas = Mole fraction x Total pressure.
0.21 = 1/20 x P
P = 4.2 atm
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From Gauss''s law it is:partial pressure of oxygen = mole fraction of O2 x total pressureorPa = Xa.Pt0.21 = 0.050 x PtPt = 0.21/0.050= 4.2 atmDerivation:Gauss''s laws states that in gaseous medium or .ie. if the mixture having all in gaseous state then some conditions have been brought under practical observation. And u will need to remind them for doing further calculations.1) Partial pressure of each gas or component is given as:Pa = Xa . Pt (say component a)orPb = Xb .Pt (say component b)2) Total pressure is equals to sum of all the partial pressures of all components (gases)Pt = Pa + Pb (always remember)If u sort out this:U will also get an relation as:Xa + Xb = 1which says that sum of the mol fractions of all component is always equals to 1.
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