stoltzfus_chem123_Midterm1_page7 - 2 O(l) H 2 O(s) IV. 2 SO...

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21. [7 points] The following reaction is exothermic. 2 S(s) + 3 O 2 (g) 2 SO 3 (g) What can we say about the spontaneity of this reaction? (a) spontaneous at all temperatures (b) spontaneous only at high temperatures (c) spontaneous only at low temperatures (d) non spontaneous at all temperatures (e) more information is need to predict if the reaction is spontaneous 22. [7 points] Consider the following five reactions. S is positive for ____ Δ reaction(s). I. BaF 2 Ba 2+ (aq) + 2F - (aq) II. 2 H 2 (g) + O 2 (g) 2 H 2 O(g) III. H
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Unformatted text preview: 2 O(l) H 2 O(s) IV. 2 SO 3 (g) 2 SO 2 (g) + O 2 (g) V. 2 Hg(l) + O 2 (g) 2 HgO(s) (a) only one (b) two (c) three (d) four (e) all five 23. [7 points] From the following H and S values predict which of the following hypothetical reactions would be spontaneous at 27 C. H (kJ/mol) S (J/mol*K) Reaction I -15.6 +123.4 Reaction II +35.7 -83.6 Reaction III -45.6 -160.3 (a) I only (b) I and II (c) I and III (d) II and III (e) I, II, and III...
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This note was uploaded on 09/15/2008 for the course CHEM 123 taught by Professor Larosa during the Spring '06 term at Ohio State.

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