solut17 - CHAPTER SEVENTEEN PROPERTIES OF SOLUTIONS 12. 125...

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504 CHAPTER SEVENTEEN PROPERTIES OF SOLUTIONS 12. 125 g sucrose × g 342.3 mol 1 = 0.365 mol; M = L sucrose mol 0.365 = L 1.00 mol 0.365 13. 0.250 L × mol g 134.0 _ L mol 0.100 = 3.35 g Na 2 C 2 O 4 14. 25.00 × 10 -3 L × L mol 0.308 = 7.70 × 10 -3 mol; L NiCl mol 10 _ 1.54 = L 0.500 mol 10 _ 7.70 2 -2 -3 NiCl 2 (s) Ni 2+ (aq) + 2 Cl - (aq); L mol 10 _ 3.08 = M ; L mol 10 _ 1.54 = -2 Cl -2 Ni - + 2 M 15. a. Ca(NO 3 ) 2 (s) Ca 2+ (aq) + 2 NO 3 - (aq); L mol 10 _ 2.12 = M ; L mol 10 _ 1.06 = -3 NO -3 Ca - 3 + 2 M b. 1.0 × 10 -3 L × mol Ca g 40.08 _ L Ca mol 10 _ 1.06 + 2 + 2 -3 = 4.2 × 10 -5 g Ca 2+ c. 1.0 × 10 -6 L × NO mol ions NO 10 _ 6.02 _ L NO mol 10 _ 2.12 - 3 - 3 23 - 3 -3 = 1.3 × 10 15 NO 3 - ions
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505 16. 1.00 L × L HCl mol 0.040 = 0.040 mol HCl; 0.040 mol HCl × HCl mol 0.25 L 1 = 0.16 L = 160 mL 17. a. HNO 3 (l) H + (aq) + NO 3 - (aq) b. Na 2 SO 4 (s) 2 Na + (aq) + SO 4 2- (aq) c. Al(NO 3 ) 3 (s) Al 3+ (aq) + 3 NO 3 - (aq) d. SrBr 2 (s) Sr 2+ (aq) + 2 Br - (aq) e. KClO 4 (s) K + (aq) + ClO 4 - (aq) f. NH 4 Br(s) NH 4 + (aq) + Br - (aq) g. NH 4 NO 3 (s) NH 4 + (aq) + NO 3 - (aq) h. CuSO 4 (s) Cu 2+ (aq) + SO 4 2- (aq) i. NaOH(s) Na + (aq) + OH - (aq)
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506 CHAPTER 17 PROPERTIES OF SOLUTIONS Concentration of Solutions 18. 1.00 L × mL g 1.00 _ L mL 1000 = 1.00 × 10 3 g solution mass % NaCl = solution g 10 _ 1.00 NaCl g 25 3 × 100 = 2.5% molarity = NaCl g 58.44 NaCl mol 1 _ solution L 1.00 NaCl g 25 = 0.43 M 1.00 × 10 3 g solution contains 25 g NaCl and 975 g H 2 O 980 g H 2 O. molality = solvent kg 0.98 NaCl mol 0.43 = 0.44 molal 0.43 mol NaCl; 980 g × g 18.0 mol 1 = 54 mol H 2 O; 54 + 0.43 0.43 = NaCl χ = 7.9 × 10 -3 19. molality = g 62.07 EG mol 1 _ kg g 1000 _ O H g 60.0 EG g 40.0 2 = 10.7 mol/kg molarity = g 62.07 mol 1 _ L cm 1000 _ cm g 1.05 _ solution g 100.0 EG g 40.0 3 3 = 6.77 mol/L 40.0 g EG × g 62.07 mol 1 = 0.644 mol EG; 60.0 g H 2 O × g 18.02 mol 1 = 3.33 mol H 2 O 0.644 + 3.33 0.644 = EG = 0.162 = mole fraction ethylene glycol 20. Hydrochloric acid (HCl):
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CHAPTER 17 PROPERTIES OF SOLUTIONS 507 molarity = g 36.5 HCl mol 1 _ L cm 1000 _ soln cm soln g 1.19 _ soln g 100. HCl g 38 3 3 = 12 mol/L molality = g 36.5 HCl mol 1 _ kg g 1000 _ solvent g 62 HCl g 38 = 17 mol/kg 38 g HCl × g 36.5 mol 1 = 1.0 mol HCl; 62 g H 2 O × g 18.0 mol 1 = 3.4 mol H 2 O mole fraction of HCl = 1.0 + 3.4 1.0 = HCl χ = 0.23 Nitric acid (HNO 3 ): g 63.0 HNO mol 1 _ L cm 1000 _ soln cm soln g 1.42 _ soln g 100. HNO g 70. 3 3 3 3 = 16 mol/L g 63.0 HNO mol 1 _ kg g 1000 _ solvent g 30. HNO g 70. 3 3 = 37 mol/kg 70. g HNO 3 × g 63.0 mol 1 = 1.1 mol HNO 3 ; 30. g H 2 O × g 18.0 mol 1 = 1.7 mol H 2 O HNO 3 = 1.1 + 1.7 1.1 = 0.39 Sulfuric acid (H 2 SO 4 ): SO H g 98.1 SO H mol 1 _ L cm 1000 _ soln cm soln g 1.84 _ soln g 100. SO H g 95 4 2 4 2 3 3 4 2 = 18 mol/L
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508 CHAPTER 17 PROPERTIES OF SOLUTIONS g 98.1 mol 1 _ kg g 1000 _ O H g 5 SO H g 95 2 4 2 = 194 mol/kg 200 mol/kg 95 g H 2 SO 4 × g 98.1 mol 1 = 0.97 mol H 2 SO 4 ; 5 g H 2 O × g 18.0 mol 1 = 0.3 mol H 2 O 0.3 + 0.97 0.97 = SO H 4 2 χ = 0.76 Acetic Acid (CH 3 CO 2 H): g 60.05 mol 1 _ L cm 1000 _ soln cm soln g 1.05 _ soln g 100. H CO CH g 99 3 3 2 3 = 17 mol/L g 60.05 mol 1 _ kg g 1000 _ O H g 1 H CO CH g 99 2 2 3 = 1600 mol/kg 2000 mol/kg 99 g CH 3 CO 2 H × g 60.05 mol 1 = 1.6 mol CH 3 CO 2 H; 1 g H 2 O × g 18.0 mol 1 = 0.06 mol H 2 O 0.06 + 1.6 1.6 = H CO CH 2 3 = 0.96 Ammonia (NH 3 ): g 17.0 mol 1 _ L cm 1000 _ cm g 0.90 _ soln g 100. NH g 28 3 3 3 = 15 mol/L g 17.0 mol 1 _ kg g 1000 _ O H g 72 NH g 28 2 3 = 23 mol/kg
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CHAPTER 17 PROPERTIES OF SOLUTIONS 509 28 g NH 3 × g 17.0 mol 1 = 1.6 mol NH 3 ; 72 g H 2 O × g 18.0 mol 1 = 4.0 mol H 2 O 1.6 + 4.0 1.6 = NH 3 χ = 0.29 21. 25 mL C 5 H 12 × mL g 0.63 = 16 g C 5 H 12 ; 25 mL × mL 0.63 × g 72.15 mol 1 = 0.22 mol C 5 H 12 45 mL C 6 H 14 × mL g 0.66 = 30. g C 6 H 14 ; 45 mL × g 86.17 mol 1 _ mL g 0.66 = 0.34 mol C 6 H 14 mass % pentane = g 30. + g 16 g 16 = 100 _ mass total pentane mass × 100 = 35% χ pentane = mol 0.34 +
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This homework help was uploaded on 04/06/2008 for the course CHEM 142 taught by Professor Zoller,williamh during the Fall '07 term at University of Washington.

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solut17 - CHAPTER SEVENTEEN PROPERTIES OF SOLUTIONS 12. 125...

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