Problem Set 10 Non-Graded Homework Solutions.pdf - CHEMISTRY 111A FALL 2019 Problem Set#10 Solutions Textbook Problems 3.45 Draw Lewis electron dot

Problem Set 10 Non-Graded Homework Solutions.pdf -...

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CHEMISTRY 111A, FALL 2019 Problem Set #10 Solutions Textbook Problems: 3.45. Draw Lewis electron dot diagrams for: (a) AsH 3 # valence electrons = 5 + 3 = 8 As H H H Note: all formal charges are zero unless otherwise indicated. (b) HOCl # valence electrons = 1 + 6 +7 = 14 H O Cl (c) KrF + # valence electrons = 8 + 7 1 = 14 Kr F (d) PO 2 Cl 2 ¯ # valence electrons = 5 + 2(6) + 2(7) + 1 = 32 P Cl Cl O O 3.47. Urea has the chemical formula (H 2 N) C O (NH 2 ). The carbon atom is bonded to both nitrogen atoms and the oxygen atom. Draw a Lewis diagram for urea and use Table 3.6 to estimate its bond lengths. # valence electrons = 4(1) + 6 + 2(5) + 4 = 24 N C N O H H H H C N bond 1.47 Å N H bond 1.01 Å C = O bond 1.20 Å
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CHEMISTRY 111A, FALL 2019 3.50. White phosphorus (P 4 ) consists of four phosphorous atoms arranged at the corners of a tetrahedron. Draw the valence electrons on this structure to give a Lewis diagram that satisfies the octet rule. # valence electrons = 4(5) = 20 P P P P 3.51. Draw Lewis electron dot diagrams for the following species, indicating formal charges and resonance diagrams where applicable. (a) H 3 N BF 3 # valence electrons = 3(1) + 5 + 3 + 3(7) = 32 (b) H 3 C C O O # valence electrons = 2(4) + 3(1) + 2(6) + 1 = 24 C O O C C O O H H H C H H H (c) HOCO 2 # valence electrons = 1 + 4 + 3(6) + 1 = 24 C O O O C O O O H H 3.55. Methyl isocyanate has the chemical formula H 3 C N C O. Draw its Lewis diagram, including resonance forms. (Note: The N atom is bonded to the two C atoms.) # valence electrons = 2(4) + 3(1) + 5 + 6 = 22 C H H H N C O C H H H N C O C H H H N C O Note: these are not equivalent resonance forms. N B F F F H H H
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