Lesson_9_-_Example_Solutions-2009

Lesson_9_-_Example_Solutions-2009 - Lesson 9 Example 9-1...

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Lesson 9 Example 9-1 Calculate the pressure exerted by 1.00 mol Cl 2 ( g ) confined to a volume of 2.0 L at: a) 0 o C b) 100 o C c) 200 o C d) 400 o C From these results, confirm the statement that a gas tends to be more ideal at high temperatures than at low temperatures. For Cl 2 , a = 6.49 L 2 .atm.mol -2 and b = 0.0562 L.mol -1 Data: T a = 0 o C = 273 K T b = 100 o C = 373 K T c = 200 o C = 473 K; T d = 400 o C = 673 K n = 1 mol V = 2.0 L a = 6.49 L 2 .atm/mol 2 1
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Lesson 9 b = 0.0562 L/mol R = 0.082 L.atm/mol.K 2 m m V a b V RT P - - = atm 89 . 9 ) mol / L 2 ( mol / atm . L 49 . 6 mol / L 0562 . 0 mol / L 0 . 2 ) K 273 )( K . mol / atm . L 082 . 0 ( V a b V RT P 2 2 2 2 m m = - - = - - = atm 19 . 11 mol / L 2 ) K 273 )( K . mol / atm . L 082 . 0 ( V RT P m ideal = = = The table below summarizes all the calculations: 2
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Lesson 9 T (K) P vdw (atm) P ideal (atm) % 273 9.89 11.19 - 13.1 3 373 14.11 15.29 -8.36 473 18.33 19.39 -5.79 673 26.77 27.59 -3.08 3
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Lesson 9 Example 9-2 A barometer tube is 100cm long and has a cross-section area of 1.20cm
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Lesson_9_-_Example_Solutions-2009 - Lesson 9 Example 9-1...

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