Assignment1

Assignment1 - C: (a) H 2( g ) + Br 2( l ) ↔ 2HBr ( g )...

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Chem 100: General Chemistry Assignment 1 (Due date: 25-3-2009) 1. Write electron configuration beyond a noble gas core (e.g. F : [He]2s 2 2p 5 ) and give number of unpaired electrons for V 2+ , Mn 2+ , Nb 3+ , Te 2- , Pb 4+ 2. Calculate the wavelength of a photon emitted by a He + cation when its electron drops from n = 4 to n = 3. (R H =109687 cm -1 ) 3. Write three resonance structures for the CNS - ion. N is the central atom. Rank them in importance. 4. Draw the most reasonable Lewis structure, predict the shape for each of the following molecules, and point out their polarity. IF 3 , IF 4 - , P(CH 3 ) 2 Cl 3 , XeF 4 , and XeO 2 F 2 5. Predict whether the entropy change is positive or negative for each of the following reactions: (a) Zn ( s ) + 2HCl ( aq ) ZnCl 2( aq ) + H 2( g ) (b) O ( g ) + O ( g ) O 2( g ) (c) NH 4 NO 3( s ) N 2 O ( g ) + 2H 2 O ( g ) (d) Ba 2+ ( aq ) + SO 4 2- ( aq ) BaSO 4( s ) (e) 2H 2 O 2( l ) 2H 2 O ( l ) + O 2( g ) 6. Calculate Δ G ° and K P for the following processes at 25 °
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Unformatted text preview: C: (a) H 2( g ) + Br 2( l ) ↔ 2HBr ( g ) (b) ½ H 2( g ) + ½Br 2( l ) ↔ HBr ( g ) Account for the differences in Δ G ° and K P obtained for (a) and (b) given that Δ G f (HBr ( g ) ) = -53.2 kJ/mol. 7. Give the oxidation-state and number of valence shell d electrons of the central metal in the following complexes. (a) [Ru(CN) 5 (H 2 O)] 2-(b) [CoH 2 (NMe 3 ) 4 ] + (c) Fe(NH 2 ) 2 (HN 2 CH 2 CH 2 NH 2 ) 2 (d) RhCl(CO)(PPh 3 ) 3 8. Draw structures of all the geometric and optical isomers of each of the following cobalt complexes: (a) [Co(NH 3 ) 6 ] 3+ , (b) [Co(NH 3 ) 5 Cl] 2+ , [Co(NH 3 ) 4 Cl 2 ] + , (d) [Co(en) 3 ] 3+ , (e) [Co(C 2 O 4 ) 3 ] 3-9. Predict the number of unpaired electrons in the following complex ions: (a) [Fe(CN) 6 ] 4-, (b) [Mn(H 2 O) 6 ] 2+...
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This note was uploaded on 04/04/2010 for the course CHEM 100 taught by Professor Linzhenyang during the Spring '10 term at HKUST.

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