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 react? 2.  How many moles of O 2  are required for complete      reaction of the H 2 ? © Lori Petrovich

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© 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?

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© 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? 1. 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 H – T S o

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© 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:
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This note was uploaded on 03/20/2008 for the course CH 101 taught by Professor Bigham during the Fall '08 term at N.C. State.

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10-26 - The H2 balloon...

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