Pentane (C_5 H_12) and hexane (C_6 H_14) form an ideal solution. At 25^∘ C the vapor pressures of pentane and hexane are 511 and 150 . torr, respectively. A solution is prepared by mixing 25 mL pentane (density, 0.63 g / mL) with 45 mL hexane (density, 0.66 g/mL). a. What is the vapor pressure of the resulting solution? b. What is the composition by mole fraction of pentane in the vapor that is in equilibrium with this solution?
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