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CH 101 notes 10-26

# CH 101 notes 10-26 - The H2 balloon...

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The H 2 balloon: http://www.youtube.com/watch?v=p3LUHAr12qI 2H 2 (g) + O 2 (g) 2H 2 O (g) PV = nRT R = 8.314 J/K*mol or 0.0821 L*atm/K*mol o K = 273.15 + o C 1. If the balloon is ~1 liter in volume, how many moles of H 2 react? 2. How many moles of O 2 are required for complete reaction of the H 2 ? © Lori Petrovich © Lori Petrovich The H 2 balloon 2H 2 (g) + O 2 (g) 2H 2 O (g) 3. Using the table of bond enthalpies below, what is the value of H o for the reaction above? Table 5 Common bond energies (kJ/mol) C-H 413 N-H 391 O-H 463 H-H 436 C-F 485 N-F 272 O-F 190 H-F 565 F-F 159 C-Cl 328 N-Cl 200 O-Cl 203 H-Cl 431 Cl-Cl 242 C-Br 276 N-Br 243 O-Br 235 H-Br 366 Br-Br 193 C-I 234 O-I 234 H-I 299 I-I 151 C-C 347 N-N 163 C-N 293 C-O 358 O-O 146 C=C 612 N=N 418 C=N 615 C=O 799 O=O 495 C C 820 N N 941 C N 891 C O 1072 © Lori Petrovich The H 2 balloon 2H 2 (g) + O 2 (g) 2H 2 O (g) 4. Based upon your calculation, is this reaction exothermic or endothermic? 5. Based upon your calculation, would the reaction feel hot or cold? © Lori Petrovich The H 2 balloon 2H 2 (g) + O 2 (g) 2H 2 O (g) Your calculation is per mol of reaction as written. 6. How much heat is released based upon the amount of H 2 in the balloon from question 1? 7. How fast would a 5 kg ball need to travel to attain that level of kinetic energy? kinetic energy = 1 / 2 mv 2 m = mass (kg) v = velocity (m/s) KE = kg × m 2 /s 2 = Joule © Lori Petrovich The H 2 balloon 2H 2 (g) + O 2 (g) 2H 2 O (g) 8. The value of S o for this reaction is: large and positive large and negative close to zero 9. This reaction is: A) extensive at any temperature B) extensive a high temperature C) extensive at low temperature D) non-extensive G o = H o – T S o © Lori Petrovich The H 2 balloon 2H 2 (g) + O 2 (g) 2H 2 O (g) 10. At low temperature, the reaction coordinate diagram looks like: 11. At high temperature, the reaction coordinate diagram looks like: reaction coordinate reaction coordinate reaction coordinate reaction coordinate reaction coordinate reaction coordinate

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© Lori Petrovich The H 2 balloon 2H 2 (g) + O 2 (g) 2H 2 O (g) 12. When heat is added to this reaction, the amount of H 2 will..
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