CHAPTER 8 MAKE UP HOMEWORK

CHAPTER 8 MAKE UP HOMEWORK - Use expanded octets as...

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CHAPTER 8 MAKE UP HOMEWORK 1. Calculate the lattice energy for CaO using the following information: Heat of formation CaO -634.9 kJ/mol Heat of sublimation of Ca 177.8 kJ/mol Bond energy for O 2 249.2 kJ/mol 1 st ionization energy of Ca 589.8 kJ/mol 2 nd ionization energy of Ca 1145.4 kJ/mol 1 st electron affinity of O -142 kJ/mol 2 nd electron affinity of O 844 kJ/mol 2. Write a Lewis structure for each of the following molecules or ions: CI 4 , N 2 O, SiH 4 , Cl 2 CO, H 3 COH. OH - , BrO - . 3. Use formal charge to determine which of the following two Lewis structures is better: 4. Write Lewis structures for each of the following molecules or ion. Include resonance structures if necessary and assign formal charges to all atoms. If necessary, expand octet on the central atom to lower formal charge. SO 4 2- , CO 3 2- , SO 3 , BrO 2 - 5. Write Lewis structures for each of the following species.
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Unformatted text preview: Use expanded octets as necessary. PF 5 , I 3-, SF 4 , GeF 4 . 6. Ethanol is a possible fuel. Use average bond energies to calculate ΔH rxn for the combustion of ethanol: CH 3 CH 2 OH (l) + 3 O 2 (g) 2 CO 2 (g) + 3 H 2 O (g) 7. Determine the electron geometry, molecular geometry, and bond angles for each of the following molecules. PF 3 , SBr 2 , CHCl 3 , CS 2 . 8. Determine the electron geometry, molecular geometry, and bond angles for each of the following molecules. CF 4 , NF 3 , OF 2 , H 2 S. 9. Which species has the smaller bond angle, ClO 4-, or ClO 3-? Explain. 10. Determine whether each of the following molecules is polar or nonpolar. ClO 3-, SCl 2 , SCl 4 , BrCl 5 ....
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This note was uploaded on 07/22/2008 for the course CHEM 105A taught by Professor Bau during the Summer '04 term at USC.

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CHAPTER 8 MAKE UP HOMEWORK - Use expanded octets as...

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