Answered: Antifreeze is composed mainly of…

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Antifreeze is composed mainly of ethylene glycol (C₂H₆O₂, d = 1.11 g/cm³). It is added to a car engine’s cooling system in the colder months to lower the freezing point of the water in the system. What volume (in milliliters) of ethylene glycol must be added to 1.50 kg of water to lower the freezing point of the solution by 6.00 °C?

Expert Solution

Step 1

The relationship between depression in freezing point (∆T_f) and molality of solition is

∆_f = k_f× molality

∆T_f = $k_{f} \times \frac{w_{1}}{m_{1} \times w_{2}}$

∆T_f = depression freezing point

k_f = freezing point constant = 1.86 °C/m for water

w₁ = mass of solute

m₁ = molar mass of solute

w₂ = mass of solvent in kg

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