F11-1251-Exam_4A_Key

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Unformatted text preview: ectronegativity is the ability of an atom in a molecule to attract shared electrons; both electron affinity and electronegativity indicate the tendency of atoms to attract electrons. 2 2. Consider the following balanced reaction: H2C=CH2(g) + 3 O2(g)2 CO2(g) + 2 H2O(g) (a) Draw out the appropriate number of Lewis structures, according to the stoichiometry, for each reactant and each product in the appropriate boxes. Be sure to label all lone pairs and non‐ zero formal charges on each atom. All Reactants All Products +2 each correct Lewis structure +2 each correct Lewis structure if correct, +1 correct number if correct, +1 correct number if correct, 1 for incorrect FC if correct, 1 for incorrect FC H H O O C C O O O O H H 6 6 (b) Calculate ∆Hrxn, in kJ, from the bond enthalpies listed to the right. Average Bond Enthalpies (kJ/mol) Hrxn = (bonds broken) (bonds formed) CO 351 CC 347 +1 coefficients x bond enthalpies; +2 correct setup C=O 799 C=C 615 =[4(413 kJ/mol) + 1(615 kJ/mol) + 3(498 kJ/mol)] CO...
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This note was uploaded on 09/20/2012 for the course CHEM 1251 taught by Professor Poler during the Fall '09 term at UNC Charlotte.

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