bonus exam final 1

bonus exam final 1 - FORM #0 Chem 1202 Bonus Final 1...

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FORM #0 ————————————————————————————————————— Chem 1202 Bonus Final ————————————————————————————————————— 1 Calculate H rxn for the reaction of B 2 H 6 with oxygen B 2 H 6 g 3O 2 g B 2 O 3 s 3H 2 O l From the following enthalpies of reaction: RXN 1. 4B s 3O 2 g 2B 2 O 3 s H 2509.1 kJ RXN 2. 2 H 2 g O 2 g 2H 2 O l H 571.7 kJ RXN 3. B 2 H 6 g 2B s 3H 2 g H 35.4 kJ ( A ) H 3116.2 kJ ( B ) H  1705.6 kJ ( C ) H 2147.5 kJ ( D ) H 1705.6 kJ ( E ) H 2147.5 kJ 2 Which of the following is the best statement of the first law of thermodynamics? ( A ) The change in the entropy of the system is positive for spontaneous processes. ( B ) Energy is conserved in all chemical and physical processes. ( C ) q  H ( D ) A spontaneous process must have G 0 ( E ) S univ S sys  S surr 3 The graph below shows the energy during the course of a reaction. Which entry, A-E, in the table correctly identifies the features G, K, H, J in the graph? E a (forward) E a (reverse) E Activated Complex (Transition State) (A) GK J H (B) JH G K (C) GJ H K (D) HK G J (E) H J
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20 40 60 80 100 120 140 160 Product Reactant K J G H Energy (kJ/mol) Reaction Coordinate 4 Choose the correct expression for the equilibrium constant, K c , for the reaction: 2Fe s 3H 2 O g Fe 2 O 3 s 3H 2 g . ( A ) K c [H 2 O] 3 /[H 2 ] 3 ( B ) K c [H 2 ] 3 2 O] 3 ( C ) K c [Fe] 2 /[Fe 2 O 3 ][H 2 ] 3 ( D ) K c [Fe] 2 [H 2 O] 3 2 O 3 2 ] 3 ( E ) K c [Fe 2 O 3 2 ] / [Fe][H 2 O] 5 Which of the following is true for the voltaic cell based on the reaction below with E cell  1.39 V. 3Ni 2 aq 2Al s 3Ni s 2Al 3 aq ( A ) Electrons flow through a wire from the cathode to the anode. ( B ) For this cell electrons flow from Al s to Ni s . ( C )Al s is the cathode. ( D ) The oxidation half reaction occurs at the cathode. ( E ) The reaction Ni 2 2e Ni s occurs at the anode. 6 Calculate the equilibrium constant, K p , at 298 K given G rxn 15. 7 kJ for the following reaction.
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H 2 (g) I 2 (g) 2HI (g) ( A ) K p 1. 01 ( B ) K p 0.994 ( C ) K p 1. 77 10 3 ( D ) K p 565. ( E ) K p 1. 85 7 Which of the following reactions is the formation reaction for NH 3 g ? ( A )NH 3 g 1 2 N 2 (g) 3 2 H 2 g ( B )N g 3H g NH 3 g ( C 4 g NH 3 g H g ( D 3 g N g 3H g ( E ) 1 2 N 2 g 3 2 H 2 g NH 3 g 8 What is the pH at the equivalence point when 225. mL of 0.77 M HF is titrated with 225.
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This note was uploaded on 12/09/2009 for the course CHEM 1202 taught by Professor Staff during the Fall '08 term at LSU.

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bonus exam final 1 - FORM #0 Chem 1202 Bonus Final 1...

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