A solution is prepared by mixing 50.0 mL of ethanol (C2H5OH; molar mass = 46.068 g/mol) in 100.0 mL of water at 20°C. The density of water and ethanol at 20°C are 1.00 g/mL and 0.789 g/mL, respectively. What is the molality of ethanol? (A) 0.086 m (B) 0.094 m (C) 1.24 m (D) 8.56 m

What is the molality of 14.5 g of MgSO4 in 285.5 mL of water at 40 °C?

(d) Determine the freezing point and boiling point of the solution. (Assume density of water = 1.00 g/mL; Kf= 1.86oC/m; Kb= 0.512oC/m; density of EG = 1.114 g/mL

If 770 g of ethylene glycol (C2H6O2) is added to 1,000. g of water, what is the freezing point?    ° C

Pentane (C5H12) and hexane (C6H14) form ideal solution. At 25oC the vapor pressure of pentane and hexane are 511 torr and 150. torr, respectively. A solution is prepared by mixing 30.0mL pentane (density = 0.63g/mL) with 45.0mL hexane (density = 0.66 g/mL). (a) What are the mole fractions of pentane and hexane, respectively,in the solution? (b) What isthe total vapor pressure of the solution at 25oC? (c) What are the mole percent of pentane and hexane, respectively, in the vapor phase at 25oC? (Molar mass of pentane and hexane are: 72.15 g/mol and 86.17 g/mol, respectively.)