The freezing point of benzene is 5.5°C. What is the freez-ing point of a solution of 5.00 g of naphthalene (C₁₀H₈) in 444 g of benzene (K(f) of benzene =4.90°C/m)?

What is the expected freezing point of a solution of 17.3 mg C9H10O3 dissolved in 0.420 g camphor (Kf = 37.7°C kg/mole, Tf = 178.4°C)?

Pentane (C3H12) and hexane (C,H14) form ideal solution. At 25°C the vapor pressure of pentane and hexane are 511 torr and 150. torr, respectively. A solution is prepared by mixing 30.0 mL pentane (density = 0.63 g/mL) with 45.0 mL hexane (density = 0.66 g/mL). (a) What are the mole fractions of pentane and hexane, respectively, in the solution? (b) What is the total vapor pressure of the solution at 25°C? (c) What are the mole percent of pentane and hexane, respectively, in the vapor phase at 25°C? (Molar mass of pentane and hexane are: 72.15 g/mol and 86.17 g/mol, respectively.)

Pentane (C5H₁2) and hexane (C6H₁4) combine to form an ideal solution. At 25°C the vapor pressures of pentane and hexane are 513 and 152 torr, respectively. A solution is prepared by mixing 26 mL of pentane (density 0.63 g/mL) with 70. mL of hexane (density 0.66 g/mL). (a) What is the vapor pressure (in torr) of this solution? torr = = (b) What is the mole fraction of pentane in the vapor that is in equilibrium with this solution?