Answered: Part 1: Urea is a common fertilizer…

Chemistry: Principles and Practice

3rd Edition

ISBN:9780534420123

Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer

Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer

Chapter12: Solutions

Section: Chapter Questions

Problem 12.98QE

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Part 1: Urea is a common fertilizer with the formula CO(NH₂)₂ that is sometimes used as a chemical de-icer 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 K_f 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?

.................... m

Using your answer from Part 1, calculate the mass of urea that must be added to 187 mL of water (density 1.00 g/mL) to lower the freezing point by 2.63°C.
mass of urea = ............... g

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