Answered: A solution contains 17.83 grams 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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Question

A solution contains 17.83 grams of magnesium chloride and 811.7 grams of water. What is the vapor pressure (in torr) of this solution at 40.00°C? The vapor pressure of water at this temperature is 55.30 torr. You should use the experimental value of the van't Hoff factor for this calculation.

(4 significant figures)

Expert Solution

Step 1

Relative lowering of vapour pressure is equal to mole fraction of solute.

$\frac{P^{o} - P}{P^{o}} = χ_{s o l u t e}$

$\frac{P^{o} - P}{P^{o}} = i * χ_{s o l u t e}$

P^o = vapour pressure of pure solvent, water = 55.30 torr

P = vapour pressure of solution

i = van't Hoff factor

= 3 for MgCl₂

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