211chp3 - Chapter 3 Homework Solutions 5 a C 2 H 5 NO 2 b...

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Unformatted text preview: Chapter 3 Homework Solutions 9/08/11 5. a) C 2 H 5 NO 2 b) MW = (2 atoms C ) & & ¡ ¢ £ £ ¤ ¥ C C atom amu 0107 . 12 + (5 atoms H ) & & ¡ ¢ £ £ ¤ ¥ H H atom amu 00794 . 1 + (1 atom N ) & & ¡ ¢ £ £ ¤ ¥ N N atom amu 0067 . 14 + (2 atoms O ) & & ¡ ¢ £ £ ¤ ¥ O O atom amu 9994 . 15 = 75.0666 amu c) %N = %) 100 ( amu 0666 . 75 atom amu 0067 . 14 ) atom 1 ( N N N & & & & & ¡ ¢ £ £ £ £ £ ¤ ¥ & & ¡ ¢ £ £ ¤ ¥ = 18.66 % 12. a) 6, 1, 2 c) 2, 2, 1, 4 e) 3, 2, 1, 6 g) 4, 9, 4, 10, 2 b) 1, 3, 2 d) 1, 6, 3, 2 f) 2, 1, 1, 2 14. a) SO 3 (g) + H 2 O ( & ) → H 2 SO 4 (aq) b) B 2 S 3 (s) + 6 H 2 O ( & ) → 2 H 3 BO 3 (aq) + 3 H 2 S (g) c) Pb(NO 3 ) 2 (aq) + 2 NaI → PbI 2 (s) + 2 NaNO 3 (aq) d) 2 Hg(NO 3 ) 2 (s) → 2 HgO (s) + 4 NO 2 (g) + O 2 (g) e) Cu (s) + 2 H 2 SO 4 (aq) → CuSO 4 (aq) + SO 2 (g) + 2 H 2 O ( & ) 16. a) 2 Ca (s) + O 2 (g) → 2 CaO (s) b) C 3 H 6 O ( & ) + 4 O 2 (g) → 3 CO 2 (g) + 3 H 2 O ( & ) 18. a) 4 Al (s) + 3 O 2 (g) → 2 Al 2 O 3 (s) b) Cu(OH) 2 (s) → CuO (s) + H 2 O (g) c) C 7 H 16 ( & ) + 11 O 2 (g) → 7 CO 2 (g) + 8 H 2 O ( & ) d) 2 C 5 H 12 O ( & ) + 15 O 2 (g) → 10 CO 2 (g) + 12 H 2 O ( & ) 20. a) 2, 9, 6, 6; combustion d) 1, 3, 2; combination b) 1, 1, 2; decomposition e) 1, 1, 2; combination c) 1, 6, 5, 3; combustion 22. a) MW N2O = (2 atoms N ) & & ¡ ¢ £ £ ¤ ¥ N N atom amu 0067 . 14 + (1 atom O ) & & ¡ ¢ £ £ ¤ ¥ O O atom amu 9994 . 15 = 44.0128 amu b) MW BA = (7 atoms C ) & & ¡ ¢ £ £ ¤ ¥ C C atom amu 0107 . 12 + (6 atoms H ) 100794 . amu atom H H ¥ ¤ £ ¢ ¡ & + (2 atoms O ) 159994 . amu atom O O ¥ ¤ £ ¢ ¡ & = 122.1213 amu c) MW MH = (1 atoms Mg ) & & ¡ ¢ £ £ ¤ ¥ Mg Mg atom amu 4.3050 2 + (2 atoms O ) 159994 . amu atom O O ¥ ¤ £ ¢ ¡ & + (2 atoms H ) 100794 . amu atom H H ¥ ¤ £ ¢ ¡ & = 58.3197 amu d) MW urea = (1 atom O & & ¡ ¢ £ £ ¤ ¥ O O atom amu 5.9994 1 + (1 atoms C ) & & ¡ ¢ £ £ ¤ ¥ C C atom amu 2.0107 1 + (2 atoms N ) 140067 . amu atom N N ¥ ¤ £ ¢ ¡ & + (4 atoms H ) 100794 . amu atom H H ¥ ¤ £ ¢ ¡ & = 60.0553 amu e) MW IA = (7 atoms C ) & & ¡ ¢ £ £ ¤ ¥ C C atom amu 0107 . 12 + (14 atoms H ) 100794 . amu atom H H ¥ ¤ £ ¢ ¡ & + (2 atoms O ) 159994 . amu atom O O ¥ ¤ £ ¢ ¡ & = 130.1849 amu 24. To save space on this problem, I am omitting the calculation of the molecular weights. a) %C = ( ) acetylene C c C g 26.0373 mol g 0107 . 12 mol 2 & & ¡ ¢ £ £ ¤ ¥ x 100% = 92.26% C [remember only report to the hundredths place] b) %H = ( ) acid ascorbic H H H g 176.1241 mol g 00794 . 1 mol 8 & & ¡ ¢ £ £ ¤ ¥ x 100% = 4.58% H c) %H = ( ) sulf. amm. H H H g 132.1395 mol g 00794 . 1 mol 8 & & ¡ ¢ £ £ ¤ ¥ x 100% = 6.10% H d) %Pt = ( ) platin- cis Pt Pt Pt g 300.045 mol g 078 . 195 mol 1 & & ¡ ¢ £ £ ¤ ¥ x 100% = 65.02% Pt e) %O = ( ) estradiol O O O g 272.3820 mol g 9994 . 15 mol 2 & & ¡ ¢ £ £ ¤ ¥ x 100% = 11.75% O f) %C = ( ) capsaiscin C C C g 305.4119305....
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211chp3 - Chapter 3 Homework Solutions 5 a C 2 H 5 NO 2 b...

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