lecture3_021107 - Heat When graphite is burned to yield...

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Heat When graphite is burned to yield CO 2 , 394 kJ of energy are released per mole of C atoms burned. When C 60 is burned to yield CO 2 approximately 435 kJ of energy is released per mole of carbon atoms burned. Would the buckyball-to-graphite conversion be exothermic or endothermic?
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Heat The reaction of A Æ B evolves 120 kJ of heat. Is the reaction exothermic or endothermic? Are the products more or less stable than the reactants? Exothermic Products are more stable
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Heat of Formation Consider the molecule diborane, B 2 H 6 , once thought of as a good fuel for the space program. Calculate Δ H for the synthesis of diborane from its elements. Use the following data: 2B (s) + 3/2O 2 (g) Æ B 2 O 3 (s) Δ H = -1273 kJ B 2 H 6 (g) + 3O 2 (g) Æ B 2 O 3 (s) + 3H 2 O (g) Δ H = -2035 kJ H 2 (g) + ½O 2 (g) Æ H 2 O (l) Δ H = -286 kJ H 2 O (l) Æ H 2 O (g) Δ H = 44 kJ 36 kJ
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Enthalpy of Reaction Using standard heats of formation, calculate the Δ H rxn for: 4NH 3 (g) + 5O 2 (g) Æ 4NO(g) + 6H 2 O(g) 3NO
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This note was uploaded on 05/18/2008 for the course CHEM 2080 taught by Professor Davis,f during the Spring '07 term at Cornell University (Engineering School).

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lecture3_021107 - Heat When graphite is burned to yield...

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