Answered: CaSO4⋅2 H2O (s) can be heated to…

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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Part 1

CaSO4⋅2 H2O (s) can be heated to completely drive off water to form CaSO4 (s). A 2.49 g sample of CaSO4⋅2 H2O (s) is heated until the mass is constant. Calculate the mass of the solid that remains after the dehydration reaction is complete. (see picture)

Part 2

The equation for the overall process of extracting Al from Al 2O3 ore is shown below.
Al2O3 (s)→2Al(s)+3/2 O2 (g) ΔH ̊ = 1675 kJ/molrxn
How much energy is saved when recycling Al vs. extracting Al from Al2O3? Justify your answer.

3. Consider heating the hydrate CaSO, 2 H,0 (s) to form the anhydrous salt, CasO, (s).
CaSO, 2 H,0 (s) 2 CaSO, (s) + 2 H,O (g)
Substance
CaSO, 2 H2O (s)
CaSO, (s)
H2O (g)
AG` (kJ/mol)
-1795.70
-1320.30
-228.59

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