The V.P of methyl and ethyl alcohol at 25°c are 9

Question

The V.P of methyl and ethyl alcohol at 25°c are 90 and 40mm of hg respectively. If 12g of CH3OH and 48g of C2H5OH are mixed calculate the V.P exerted by each component the total vapour pressure of mixture and the composition of mixture?

Arun · Accepted Answer

Please find the answer to your question Ptotal = pA + pBMolecular weight of CH3OH = 12 + 3 + 16 + 1 = 32Molecular weight of C­2H5OH = 24 + 5 + 16 + 1 = 46According to Raoult’s lawPtotal = p1 + p2Where Ptotal = Total vapour pressure of the solutionP1 = Partial vapour pressure of one componentP2 = Partial vapour pressure of other componenetAgain, p1 = Vapour pressure (po1) * mole fractionSimilarly, p2 = Vapour pressure (po2) * mole fractionMole fraction of CH3OH = 12/32 /(12/32+48/46) = 0.264Mole fraction of ethanol = 48/46 /(48/46+12/32) = 0.735NOTE THIS STEP : Thus now let us first calculate the partial vapour pressures, i.e., p1 and p2 of the two component.Partial vapour pressure of CH3OH(p1)= 90 * 0.264 = 23.76 mm∴ Total vapour pressure of the solution= 29.4 + 23.76 mm = 53.16 mmMole fraction of CH3OH in vapour = 23.76/53.16 = 0.44

Physical Chemistry> The V.P of methyl and ethyl alcohol at 25...

The V.P of methyl and ethyl alcohol at 25°c are 90 and 40mm of hg respectively. If 12g of CH3OH and 48g of C2H5OH are mixed calculate the V.P exerted by each component the total vapour pressure of mixture and the composition of mixture?

Govind Nair , 6 Years ago

Arun

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Physical Chemistry> The V.P of methyl and ethyl alcohol at 25...

The V.P of methyl and ethyl alcohol at 25°c are 90 and 40mm of hg respectively. If 12g of CH3OH and 48g of C2H5OH are mixed calculate the V.P exerted by each component the total vapour pressure of mixture and the composition of mixture?

Govind Nair , 6 Years ago

Arun

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