Chemistry Practice Problems Freezing Point Depression Practice Problems Solution: Urea is a common fertilizer with the formula CO(NH...

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Solution: Urea is a common fertilizer with the formula CO(NH2)2 that is sometimes used as a chemical deicer for icy road surfaces in the winter months. Adding a solute to a solvent causes the freezing point to be lowered and allows the solvent to remain liquid at lower temperatures. The value of Kf for water is 1.86°C/m, and its normal freezing point is 0.00°C, Urea is a nonvolatile nonelectrolyte solute. What molality of urea is required to lower the freezing point of ice water by 2.63°C? Part 2Using your answer from Part 1, calculate the mass of urea that must be added to 427 mL of water (density 1.00 g/mL) to lower the freezing point by 2.63°C. 

Problem

Urea is a common fertilizer with the formula CO(NH2)2 that is sometimes used as a chemical deicer for icy road surfaces in the winter months. Adding a solute to a solvent causes the freezing point to be lowered and allows the solvent to remain liquid at lower temperatures. 

The value of Kf for water is 1.86°C/m, and its normal freezing point is 0.00°C, Urea is a nonvolatile nonelectrolyte solute. 

What molality of urea is required to lower the freezing point of ice water by 2.63°C? 

Part 2

Using your answer from Part 1, calculate the mass of urea that must be added to 427 mL of water (density 1.00 g/mL) to lower the freezing point by 2.63°C. 

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