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Problem Set 7

Problem Set 7 - Name Section Rec TA Side 1 of 3 Ch 1a...

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Name Ch 1a, Problem Set Seven Section Side 1 of 3 Due Friday, Nov. 12, 2004 Rec TA at 4 PM in the SAC Problems 3 and 6 are designated as no collaboration problems. 1. (50 points) Consider the neutral, anion, and cation species for each of the following homonuclear diatomics. Using the general MO diagram given for homonuclear diatomics, list the orbital configuration (eg: 1s σ b 2 1s σ *2 2p x,y π b 4 2p σ b 2 …) and bond order (eg: 0.5, 1.5, 2, etc.) for each of the following molecules and ions. Also label which species are paramagnetic and which are diamagnetic. a. Hydrogen (i.e. H 2 + , H 2 , H 2 " ) b. Helium (i.e. He 2 + , He 2 , He 2 " ) c. Lithium (…) d. Berillium (…) e. Carbon (…) f. Nitrogen (…) g. Oxygen (…) h. Fluorine (…) 2. (40 points) Hydrazoic acid, HN 3 , is a fun compound to work with: not only does it have an irritating odor that is dangerous at concentrations of less than 1 ppm, but in solution it is potentially explosive. Assume the connectivity of atoms in the compounds is the following ( a , b , and c are arbitrary indices to label the nitrogens): N a " N b " N c " H a. Draw the three most reasonable resonance structures of HN 3 . In each case, give the formal charges on the nitrogen atoms in each resonance form, and estimate the N a " N b " N c and N b " N c " H bond angles in each resonance form. b. The measured N b " N c " H bond angle is 112°. Use VSEPR theory to select the resonance structure(s) that best describe the true structure of this molecule and predict the bond angle. Explain your answer.
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