Chem 126 - Online HW 3

Chem 126 - Online HW 3 - Question 1(Name:Arshi Imtiaz The...

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Question 1 (Name:Arshi Imtiaz) The heat of vaporization, ∆H vap , of a certain liquid at 25 o C is 17.1. kJ/mol. If one mole of the liquid has an entropy of 235 J/K, what is the entropy of one mole of the vapor in equilibrium with the liquid at this temperature? 919 J/(mol . K) 57.4 J/(mol . K) 235 J/(mol . K) 236 J/(mol . K) 292 J/(mol . K) Question 2 (Name:Arshi Imtiaz) Predict the sign of ∆S o for the following reaction: C 2 H 5 OH( l ) → C 2 H 5 OH( s ) negative positive cannot be predicted from the rules given Question 3 (Name:Arshi Imtiaz) Given the following information at 25 o C, calculate ∆S o at 25 o C for the following reaction: 2 A( g ) + 4 B( g ) → 4 C( g ) + 5 D( g ) Substance S o (J/mol . K) A( g ) 192 B( g ) 266 C( g ) 203 D( g ) 228 504 J/K -483 J/K -504 J/K 1
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613 J/K -27.0 J/K 381 J/K 597 J/K Question 4 (Name:Arshi Imtiaz) Given the following information at 25 o C, calculate ∆G o at 25 o C for the reaction: 2 A( g ) + B( g ) → 3 C( g ) Substance ∆H f o (kJ/mol) S o (J/mol . K) A( g ) -102 274 B( g ) -122 281 C( g ) -197 314 -177 kJ -299 kJ 299 kJ 98.9 kJ -98.9 kJ Question 5 (Name:Arshi Imtiaz) Given the following information at 25 o C, calculate ∆G o at 25 o C for the following reaction: 2 A( g ) + 3 B( g ) → 3 C( g ) + 4 D( g ) Substance ∆G f o (kJ/mol) A( g ) 64.8 B( g ) -98.9 2
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C( g ) -126 D( g ) -479 2.13 x 10 3 kJ -1.70 x 10 3 kJ -2.47 x 10 3 kJ -1.77 x 10 3 kJ -2.13 x 10 3 kJ 571 kJ -571 kJ Question 6 (Name:Arshi Imtiaz) ∆H o = 174 kJ and ∆G o = 131 kJ for a certain reaction. What does the magnitude of the value of ∆G o indicate and how can the signs for ∆H o and ∆G o be interpreted? the reaction is exothermic and the equilibrium composition is mostly reactants the reaction is endothermic and the equilibrium composition is mostly reactants the reaction is endothermic and the equilibrium composition is mostly products the reaction is exothermic and the equilibrium composition is mostly products the reaction is exothermic and the equilibrium mixture contains significant amounts of both reactants and products Question 7
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This note was uploaded on 04/09/2008 for the course CHEM 126 taught by Professor Bussell during the Winter '07 term at Western Washington.

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Chem 126 - Online HW 3 - Question 1(Name:Arshi Imtiaz The...

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