1441test3 - 1441 Test 3 Chapters 6, 7 & 8 (Silberberg)...

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1441 Test 3 Chapters 6, 7 & 8 (Silberberg) Website: http://dipowell1.home.mindspring.com Chapter 6 (Thermochemistry) 1. If a reaction is endothermic, then the : (a) reaction liberates heat (b) enthalpy of the reactants is higher than the enthalpy of the products (c) reaction cannot occur (d) enthalpy difference between products and reactants ( H) is positive (e) temperature will increase if the reaction occurs in a calorimeter 2. Which of the following chemical equations correctly represents the reaction in which the standard molar heat of formation of CO 2 is liberated? (a) C(g) + O 2 (g) CO 2 (g) (b) 2CO(g) + O 2 (g) 2CO 2 (g) (c) C(s) + O 2 (g) CO 2 (g) (d) C(s) + 2O(g) CO 2 (g) 3. What is the enthalpy change for the following reaction at standard conditions? SO 2 (g) + 3 H 2 (g) H 2 S(g) + 2 H 2 O(l) H f SO 2 (g) = -71.0 kcal/mole , H f H 2 S(g) = -4.8 kcal/mole , H f H 2 O(l) = -68.3 kcal/mole. 4. Calculate the enthalpy change for the reaction: 2NaBr(s) + I 2 (s) 2NaI(s) + Br 2 (g) Use the following data: Na(s) + ½ Br 2 (l) NaBr(s) H = -86 kcal Na(s) + ½ I 2 (s) NaI(s) H = -68.8 kcal Br 2 (l) Br 2 (g) H = 7.4 kcal 5. Calculate the Enthalpy change for: 2B(s) + 3H 2 (g) B 2 H 6 (g) given: 2B(s) + 3/2 O 2 (g) B 2 O 3 (s) ∆H = -1273 kJ B 2 H 6 (g) + 3O 2 (g) B 2 O 3 (s) + 3H 2 O(g) ∆H = -2035 kJ H 2 (g) + 1/2 O 2 (g) H 2 O(l) ∆H = -286 kJ H 2 O(l) H 2 O(g) ∆H = 44 kJ 6. CH 4 + 4Cl 2 CCl 4 + 4HCl H rxn = -4.34 X 10 5 J Based on the above reaction, what would be the energy change is 32 g of CH 4 reacted with an excess of chlorine? Is the energy absorbed or released? 7. N 2 + 3H 2 2NH 3 H = -92.2 kJ What is E? (reaction is carried out at constant P and 40 atm. Also, V = -1.12L.) 8. A balloon is inflated to its full extent by heating the air inside it. In the final stages of
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This note was uploaded on 10/13/2009 for the course CHEM 1441 taught by Professor Tanizaki during the Spring '08 term at UT Arlington.

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1441test3 - 1441 Test 3 Chapters 6, 7 & 8 (Silberberg)...

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