Ch19_Examples

# Ch19_Examples - ∆ S o is positive b/c ∆ S o is negative...

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Given: bp of Hg = -38.9 oC = (-38.9+ 273.15 ) K = 234.3 K H fusion = 2.29 kJ/mol m = 50.0 g Hg(l) n = 50.0 g / (200.59 g/mol) = 0.249 mol Asks : S sys at 38.9 o C and S surr at 38.9 o C Formulas : S sys = q sys / T where q sys = H fusion * n (mol) q sys = -q surr S surr = q surr / T surr = 571 J/ 234.3 K = 2.44J/K What is the entropy change of the surrounding at 38.9 o C? Ex. 19.2

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Given: Formula: Ex. 19.5
Given: H f o and S o values in Appendix C. Asks: a) G o sign when T is increasing and b) G o at 25 o C and 500 o C Formulas: a) -T

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Unformatted text preview: ∆ S o is positive b/c ∆ S o is negative ( ∆ n < 0) so ∆ G o increases with T. See example for details Exercise 19.9 Cont. . b) Given: P(N 2 ) = 1 atm, P(H 2 ) = 3.0 atm, P(NH 3 ) = 0.5 atm, and ∆ G o = -33.3 kJ (from previous example or using the table for ∆ G f o in Appendix C) Asks: ∆ G under non-standard conditions. Formula: Reaction shifts to right to produce more NH 3 and to reach the equilibrium. Forward rxn is spontaneous....
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## This note was uploaded on 11/12/2010 for the course CHE 107 taught by Professor Yok during the Spring '10 term at Middle East Technical University.

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Ch19_Examples - ∆ S o is positive b/c ∆ S o is negative...

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