Bookmarks People Window Help e PresídioT x 1 G ln This Phx A sign off-X y J, Ber

Question

Bookmarks People Window Help e PresídioT x 1 G ln This Phx A sign off-X y J, Berkeley c x ( ems/mod/bis/view.php?id=4055649 Berkeley c × (q: Mail-109 Presidio Trails Run- u Make your own Rawa. O Physical Therapy As- 100 Paleo Breakfas D che Jump to stion 9 of 18 Sapling Learning Biphenyl, CHo, is a nonvolatile, nonionizing solute that is soluble in benzene, CeHe At 25 C, the vapor pressure of pure benzene is 100.84 torr. What is the vapor pressure of a solution made rom dissolving 12.9 g of biphenyl in 28.7 g of benzene? Number torr Check Answer Next Ent-

Explanation / Answer

molar mass of biphenyl = 154.21 g/mol

molar mass of benzene = 78.11 g/mol

moles = grams/molar mass

moles of biphenyl = 12.9 g/154.21 g/mol = 0.084 mol

moles of benzene = 28.7 g/78.11 g/mol = 0.367 mol

Total moles = 0.451 mol

mole fraction of benzene = moles benzene/total moles

                                         = 0.367/0.451 = 0.814

According to the Raoult's law,

vapor pressure of solution = mole fraction of solvent x vapor pressure of pure solvent

                                          = 0.814 x 100.84 torr

                                          = 82.084 torr

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