key to homework 13 - Homework#13(dealing with material in...

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Unformatted text preview: Homework #13 (dealing with material in chapter 8 of the text) _ Due: before class on Tuesday, April 1, 2008 - 1. For each of the following species, write the Lewis dot-structure, attempting to satisfy the octet rule if possible. If resonance occurs, draw all resonance structures. Determine the formal charge and oxidation number of each atom in each species. (a.) (1304)3 ‘ , (b.) (c03)2‘ , (c.) XeF4, (d.) ozone (o — o — 0) 2. For any of the species in question 2 having a central element capable of an expanded octet (from coordination number 4 to 5 and 6) and with external elements capable of forming multiple bonds, write possible expanded dot—structures and comment on whether they contribute much to the stability of the species. 3. Enter the letter (A or B) of the correct response in the blank provided. (a.) Which species is isoelectronic with NO_, A. OF+, or B. OF_? “‘5 'l DP? (b.) How many valence electrons are in BF3, A. 24, or B. 26? ‘ (c.) How many bonding electron pairs are in BF3, A. 3, or B. 4? , .. l (d.) How many non—bonding electron pairs are in BF3, A. 9, or B. 10? A 4. Using bond enthalpies from Table 8.4 on page 330 in the text, estimate AHfO for NH3 (gas). (m: You must write the formation reaction for one mole of ammonia from its elements in their standard states.) Compare your answer with the accepted value (found in the table of Appendix C, page 1123 of the text) by calculating a percent error. |(estimated value) — (accepted value) I 2 % error: ———————x 10. (accepted value) 'éflzfid 1" '2: H26) '9 “#3 6') AH=—§BF/H +328f/H_H "BEHN-H ‘— .m- _.-— : 4101 W) + —§(+‘s<.) ’ 31%?!) :l/— ['46:]? Hyp {ix (1J (Al/7:36))”: r .— ‘1- l-fl feet?) ' ? -_,_i%fi Kim ..—- -—-—--' Kc “a I ll \_ J FIT-7 = @ (C) aiuuF‘ 0L???- Vo+ gar» MQ bus-cg; mm 1 WHO“ II; 1457‘ ’00‘5'5£é(e ' 3 ® '0 —-~ . ___. I “=- v, o o“ '35:) :22 E9 ((5- 6)? (fir-0N0?) 4/ rev 3 on—q e->é-b=§ : “6‘”me LN Sm... ...
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