stoltzfus_chem123_Midterm1_page6

stoltzfus_chem123_Midterm1_page6 - (g) + HCl(g) NH → 4...

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18. [7 points] Which of the following is always positive when a spontaneous process occurs? (a) G Δ system (b) G Δ surroundings (c) G Δ universe (d) S Δ system (e) S Δ universe 19. [7 points] Which of the following substances will have the largest standard molar entropy, S ° ? (a) HCl (l) (b) HCl (s) (c) HCl (g) (d) HBr (g) (e) HI (g) 20. [7 points] Consider the reaction: NH 3
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Unformatted text preview: (g) + HCl(g) NH → 4 Cl(s) Given the following table of thermodynamic data at 298 K: Substance H Δ f ° (kJ/mol) S Δ ° (J/mol*K) NH 3 (g) -46.2 192.5 HCl(g) -92.3 186.7 NH 4 Cl(s) -314.4 94.6 The value of G Δ ° for the reaction is_________________. (a) -91.1 kJ (b) -34.7 kJ (c) -260.7 kJ (d) 108.7 kJ (e) 8.50 x 10 3 kJ...
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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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