A chemical equilibrium that favors products at high t

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15. A chemical equilibrium that favors products at high T and reactants at low T is expected to have ___. A) Δ H o < 0, Δ S o < 0 B) Δ H o > 0, Δ S o < 0 C) Δ H o > 0, Δ S o > 0 D) Δ H o < 0, Δ S o > 0 16. A reaction at 298 ° K that has Δ H o = -26.9 kJ and Δ S o = 11.3 J/K has Δ G o = ___kJ. 17.Use the absolute entropies to find Δ S o (J/K) for the reaction KBrO 3 (s) KBr(s) + 3/2 O 2 (g) at 25ºC.
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CH 223: 11:00 AM Spring 2012 6 of 7 18.Calculate K p for the reaction at 500 K: 2NH 3 (g) 3 H 2 (g) + N 2 (g) , Δ H ° = 92 kJ Δ S ° = 197 J/K 19. Determine the equilibrium constant ( K p ) at 25 ° C for the reaction CO(g) + H 2 O(g) CO 2 (g) + H 2 (g) , Δ G ° = -28.5 kJ/mol. A) 2.9 x 10 -60 B) 1.0 x 10 -4 C) 1.2 D) 1.0 x 10 5 E) 3.4 x 10 59 20.For the reaction 2C(graphite) + H 2 (g) C 2 H 2 (g), Δ G ° = +209.2 kJ/mol at 25 ° C. If P(H 2 ) = 100. atm, and P(C 2 H 2 ) = 0.10 atm, calculate Δ G for this reaction.
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CH 223: 11:00 AM Spring 2012 7 of 7 21.The equilibrium constant K p for the reaction CO( g ) + 3H 2 ( g ) CH 4 ( g ) + H 2 O( g ) is 190 at 1000°C. What additional information is needed to calculate Δ H ° rxn ?
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