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Chem 1 exam 4 fall 07 - Chemistry 1450 Exam 4 Fall 2007...

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Chemistry 1450, Exam 4 Fall 2007 Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. The following ball-and-stick molecular model is a representation of the amino acid alanine (unshaded spheres = H). Only the connections between atoms are shown; multiple bonds and nonbonded electrons are not indicated. 1) What is geometry around the carbon atom labeled C 1 ? A) bent B) tetrahedral C) trigonal planar D) trigonal pyramidal 1) 2) What is the hybridization of the carbon atom labeled C 3 ? 2) 3) Use the given standard enthalpies of formation to calculate • H ° for the following reaction 3 Fe 2 O 3 ( s ) + CO( g ) • 2 Fe 3 O 4 ( s ) + CO 2 ( g ). Species H ° f , kJ/mol Fe 2 O 3 ( s ) -824.2 Fe 3 O 4 ( s ) -1118.4 CO ( g ) -110.5 CO 2 ( g ) -393.5 3) 4) The values of • H ° f for the three states of benzene are approximately -22 kcal/mol, -11 kcal/mol, and 20 kcal/mol. Which is the value for solid benzene? 4) 1
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