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Molarity, Molar Mass, Oxidizing Agents, Mole Fraction and More

7 general chemistry questions.

Example: At 20 degrees Celcius, the vapor pressure of toluene is 22 mm Hg and that of benzene is 75 mm Hg. An ideal solution, equimolar in toluene and benzene, is prepared. At 20 degrees Celcius, what is the mole fraction of benzene in the vapour in equlibrium with this solution?
(a) 0.23
(b) 0.29
(c) 0.50
(d) 0.77
(e) 0.83

*(Please see attachment for complete equations and problems)