Answered: A certain liquid X has a normal boiling…

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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A certain liquid X has a normal boiling point of 105.70°C and a boiling point elevation constant =Kb2.16·°C·kgmol−1. A solution is prepared by dissolving some potassium bromide (KBr) in 400.g of X. This solution boils at 107.3°C. Calculate the mass of KBr that was dissolved. Round your answer to 2 significant digits. ____g

Expert Solution

Step 1

The boiling point of the pure liquid = 105.70 ⁰C.

The boiling point of the solution = 107.3 ⁰C.

Elevation in boiling point = 1.6 ⁰C.

K_b = 2.16 ⁰C. kg mol^-1.

Mass of solvent = 400 g

Mass of solute = W_A

Molar mass of solute (KBr) = 119 g/mol (M_A)

Vant Hoff factor for KBr = 2

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