dicate the answer choice that best completes the statement or answers the questi
ID: 703172 • Letter: D
Question
dicate the answer choice that best completes the statement or answers the question. J Benzene, (MW 78.11 g/mol) Cole, and toluene.(MW 92.14 ymol) Col,CH3, form ideal solutions. At 35°C the vapor pressure of benzene is 160. torr and that of toluene is 50.0 torr. In an experiment, s the gufbenvene and 56.2 g of toluene are placed in a closed container at 35s"C. At equilibrium, what is the partial vapor pressure of benzene? a 116 torr b. 89.6 torr c. 22.0 torr d. 70.4 torr e. 28.0 torr 22. What is the vapor pressure at 75°C of an aqueous solution prepared by the addition of 60.1 g of the nonvolatile solute urea, CO(ONH2)2, to 179 g of water? The vapor pressure of pure water at 75 C 290. mmHg. a. 263 mmHg 5.) 21 7 mmilg c. 137 mmHg d. 26.5 mmHg e. 153 mmHgExplanation / Answer
Ans 21
Moles of benzene = mass/molecular weight
= 60.6g / 78.11g/mol
= 0.7758 mol
Moles of toluene = mass/molecular weight
= 56.2g / 92.14g/mol
= 0.6099 mol
Total Moles = 1.3857 mol
Mol fraction of benzene = moles of benzene /total moles
= 0.7758/1.3857
= 0.5598
Mol fraction of toluene = moles of toluene /total moles
= 0.6099/1.3857
= 0.4402
From the Raoult’s law
Partial vapor pressure of benzene
= mol fraction of benzene x vapor pressure of benzene
= 0.5598 x 160
= 89.58
= 89.6 torr
Option B is the correct answer
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