To determine the molar mass of an unknown, a student dissolved 0.201 gr of the unknown in 40 gr cyclohexane. If the freezing point decreases by 0.7°C, which of the following could be the unknown? (Note: Kt cyclohexane = 20.5 Kg.°C/mol) 1,4_dichlorobenzene (Mm = 147 g/mol) Naphthalene (Mm = 128.17 g/mol) Biphenyl (Mm= 154.21 g/mol) Phenol (Mm = 94.11 g/mol)

A solution of 4.63 g of anhydrous aluminum chloride (AlCl3) in 59.08 g of water freezes at -4.37 degrees celsius. Kf (AlCl3) =1.86 degrees celsius/m part 1: calculate the molar mass of AlCl3 from the formula. Round the answer to the hundredths place. ___ g/mol Part 2: Calculate the molar mass from the freezing point depression, assuming AlCl3 does not dissociate in ions. Round to 3 Significant digits. Part 3: Comparing the two values, how many ions will AlCl3 form? Round the answer to the nearest whole number.

0.0851 kg of biphenyl (C H,) is dissolve in benzene (CH) to create a solution with a total volume of 350.0 mL. (Assume the change in volume is negligible) If the boiling point of pure benzene is 80.1 °C, then what would be the boiling point of this solution in °C? (Kb for benzene is 2.53 °C/m and the density of benzene is 0.877 g/mL)

The freezing point of pure water is 0°C and its molal freezing point depression constant (Kf) is 1.86°C/m. a. What is the change in the freezing point (∆Tf) of a solution that contains 53 grams of sucrose (MW= 342.3 g/mol) dissolved in 1000 grams of water.