hmwk9 - Chemistry 2090 Homework#9 Please hand in the...

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Chemistry 2090 Homework #9 Please hand in the following problems at the beginning of class on November 7. In addition, please answer questions 40, 44, 50 and 58 from Chapter 11 of Petrucci et al. 1. Predict based on simple molecular orbital theory whether H 2 or He + 2 requires more energy to remove the highest-energy electron. 2. Suppose we supply enough energy to a molecule of H 2 to remove one of its electrons. In the resulting ion H + 2 , is the binding energy of remaining electron higher, the same, or lower than that of the electron which we removed? Is the bond length in the ion longer, the same or shorter than in the molecule? Explain. 3. Below at left is shown the MO diagram appropriate to the molecule HF. Place electrons in all the occupied atomic and molecular orbitals, label each of the MO’s (i.e. as σ or π , and whether they are bonding, non-bonding or anti-bonding). Explain why the F 2 s orbital is not lowered in energy when the MO’s are formed. 4. The compound nitrogen oxide (NO) forms when nitrogen and oxygen are heated together; it was one of the pollutants largely eliminated from car engines with the introduction of the catalytic
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