Topical Questions
These questions are keyed to 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.
Without consulting a table of standard molar entropies, predict whether ΔS°system will be positive or negative for each of these reactions.
(a) 2 NH3(g) → N2(g) + 3 H2(g)
(b) 2 Na(s) + Cl2(g) → 2 NaCl(s)
(c) H2(g) + I2(s) → 2 HI(g)
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