saplinglearning.com California State L Dashboard - My Study Life Sapling -178-CH

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saplinglearning.com California State L Dashboard - My Study Life Sapling -178-CHEM111-01-4360 rsity, Chico-CHEM 111-Fall17- HILLYARD Activities and Due Dates HW 12 /11/2017 09:55 AM 4 3.9/10 12/7/2017 01:31 PM Print CalculatorPeriodic Table on 18 of 34 Map ot Sapling Learning Biphenyl, CoHo, is a nonvolatile, nonionizing solute that is soluble in benzene, CsHe At 25 the vapor pressure o pure benzene 10 84 torr what is the vapor pressure of a solution made from dissolving 16.8 g of biphenyl in 31.9 g of benzene? Number torr 0 Previous Give Up & View Solution 0 Check Answer e Next -el Exit Hint

Explanation / Answer

P0 - Ps / P0 = X2

X2 = mole fraction of solute

X2 = moles of solute / total moles

nbiphenyl = 16.8 / 154.21 = 0.109

nbenzene = 31.9 / 78.11 = 0.408

X2 = 0.109 / 0.109 + 0.408 = 0.109 / 0.517

X2 = 0.211

100.84 - Ps / 100.84 = 0.211

100.84 - Ps = 21.28

Ps = 79.56 torr

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