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79 solutions

Freezing Point Depression

Q. Calculate the molality and van't Hoff factor (i) for the following aqueous solution: 0.450 mass % KCl, freezing point = -0.210 degrees C

Solved • Sep 14, 2019

Freezing Point Depression

Q. If a 0.900 𝑚 aqueous solution freezes at −3.50 ∘C, what is the van't Hoff factor, 𝑖, of the solute? Consult the table of 𝐾 f values.

Solved • Sep 16, 2019

Freezing Point Depression

Q. Evaluate the following statement as true or false: The freezing point of a 0.15m MgCl2(aq) should theoretically be lower than the freezing point of a 0.25 m KI(aq). Explain your reasoning.

Solved • Sep 16, 2019

Freezing Point Depression

Q. When 7.94g of xylene was added to 132.5g of cyclohexane, the freezing point of the solution was -4.9 degrees Celsius. What is the molar mass of xylene?

Solved • Sep 14, 2019

Freezing Point Depression

Q. What is the molar mass of toluene(MW=92.14g/mol)if 0.85 g of toluene depresses the freezing point of 100. g of benzene by 0.47°C? Kfof benzene is 5.12°C/m

Solved • Sep 12, 2019

Freezing Point Depression

Q. Assuming complete dissociation of the solute, how many grams of KNO3 must be added to 275 mL of water to produce a solution that freezes at -14.5 degrees? The freezing point for pure water is 0.0 degrees C and Kf is equal to 1.86 degrees C/m. Express your answer to three significant figures and include the appropriate units.

Solved • Sep 9, 2019

Freezing Point Depression

Q. Ethylene glycol, the primary ingredient in antifreeze, has the chemical formula C2H6O2. The radiator fluid used in most cars is a half-and-half mixture of water and antifreeze. What is the freezing point if radiator fluid that is 50% antifreeze by mass? Kf for water is 1.86 degrees C/m Express your answer to three significant figures and include the appropriate units.

Solved • Sep 9, 2019