題組內容

7. Pentane (616937ceb5b1e.jpg) and hexane (616937d51459a.jpg) 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).

(b) What is the composition by mole fraction of pentane in the vapor that is in equilibrium with this solution? (2%)