Topical Questions
These questions are keyed to the major topics in the chapter. Usually a question that is answered at the back of this book is paired with a similar one that is not.
Lime, CaO(s), can be produced by heating limestone, CaCO3(s), to decompose it.
(a) Write a balanced equation for the reaction.
(b) Predict the sign of the enthalpy change for the reaction.
(c) From the data in Appendix J, calculate ΔH° for this reaction at 25 °C to verify or contradict your prediction in part (b).
(d) Predict the entropy effect for this reaction.
(e) Is the reaction favored by entropy, energy, both, or neither?
(f ) Explain in terms of Le Chatelier’s principle why limestone must be heated to make lime.
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