Answer all three questions.

You made an aqueous solution with a freezing point of -.246 C. What is the comcentration (in molality) of the solution ?

1. You made an aqueous solution with a freezing point of 0.246+C. What is the concentration (in molality) of the solution? . (Pure water freezes at 0C;K1=1.86Ckg/mol ) a) 0.132m b) 0.259m c) 0.0261m d) 0.0132m e) 0.500m 2. A sample of an organic compound (a nonelectrolyte) weighing 1.62g lowered the freezing point. of 13.2g of benzene by 2.66C. Assuming ideal solution behavior, calculate the molar mass of the compound (Kf=5.12oC/m). a) 236g/mol b) 118g/mol c) 472g/mol d) 944g/mol e) 1,888g/mol 3. Assuming ideal solution behavior, what is the osmotic pressure of an aqueous solution of 1.79g of Ca(NO3)2 in water at 25C ? The volume of the solution is 363mL. (Hint: needs van't Hoff factor, i ) a) 1.10atm b) 2.20atm c) 3.30atm d) 4.40atm e) 0.98atm