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.
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.
Chemistry & Chemical Reactivity
10th Edition
ISBN:9781337399074
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter18: Principles Of Chemical Reactivity: Entropy And Free Energy
Section: Chapter Questions
Problem 65GQ: Sodium reacts violently with water according to the equation Na(s) + H2O() NaOH(aq) + H2(g)...
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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.
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