At 55.0 ?C, what is the vapor pressure of a solution prepared by dissolving 70.6g of...

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Chemistry

At 55.0 ?C, what is the vapor pressure of a solution prepared bydissolving 70.6g of LiF in 265g of water? The vapor pressure ofwater at 55.0 ?C is 118 mmHg. Assume complete dissociation of thesolute.
The solvent for an organic reaction is prepared by mixing 60.0mLof acetone (C3H6O) with 59.0mLof ethyl acetate (C4H8O2). Thismixture is stored at 25.0 ?C. The vapor pressure and the densitiesfor the two pure components at 25.0 ?C are given in the followingtable. What is the vapor pressure of the stored mixture?
Compound Vapor pressure
(mmHg) Density
(g/mL)
acetone 230.0 0.791
ethyl acetate 95.38 0.900

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3.9 Ratings (383 Votes)

1st part According to Raoults law P xP0 where P is the vapor pressure of solution and P0 for pure solvent x is the mole fraction of the solvent Now molar mass of LiF is 2594 therefore no of moles of LiF 706 2594 2723 mol No of moles of water 285 18 14722 mol so total no of moles 14722 2723 17445 mol See Answer

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Compound	Vapor pressure (mmHg)	Density (g/mL)
acetone	230.0	0.791
ethyl acetate	95.38	0.900