Catalytic Converter (PowerPoint download)

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					                                      Catalytic Converter

                   NO                      NO                                                                 NN
    NO                                                                                        N
                                                                                          N           O
                                                                                                  O
                NO                                                                                            N
                                     NO                                                                   N       O
                                                                                          OO                      O

                                                                          N   O
                                                                 N                    N
                                                                 O
                                                                      N               O
                                                                              O
                             NO                                   N               O
                                                                 O            N

                          One of the reactions that takes place in the catalytic converter
                   is the decomposition of nitrogen (II) oxide (NO) to nitrogen and oxygen gas.
Smoot, Smith, Price, Chemistry A Modern Course, 1990, page 454
                Catalytic Converter
 2 CO(g) + 2 NO(g)                        catalyst                   N 2(g) + 2 CO2(g)

                     O
CO                  C                                                   N
                                                                    N            O
                                                                            OC
     NO        NO
                                                                                  OC
                                                                                        O


                                                      O
                                  N               C
                                      N
                                              C
                                          O
                                                          OO


 One of the reactions that takes place in the catalytic converter is the decomposition of
 carbon monoxide (CO) to carbon dioxide and nitrogen (II) oxide (NO) to nitrogen gas.
                                              Enthalpy Diagram
                                                                   H2(g) + ½ O2(g)


             DH = +242 kJ                                        -242 kJ             -286 kJ                DH = -286 kJ
             Endothermic                                        Exothermic         Endothermic               Exothermic
   Energy




                                            H2O(g)
                                                                               -44 kJ
                                                                             Exothermic
                                                          +44 kJ
                                                        Endothermic

                                                                                                 H2O(l)

                                H2(g) + 1/2O2(g)  H2O(g) + 242 kJ                           DH = -242 kJ
Kotz, Purcell, Chemistry & Chemical Reactivity 1991, page 211
                          Hess’s Law
    Calculate the enthalpy of formation of carbon dioxide from its elements.
                       C(g) + 2O(g)  CO2(g)

              Use the following data:
              2O(g)  O2(g)2                       DH   =   - 250 kJ
              C(g)  C(s)
              C(s)  C(g)                          DH   =   - 720
                                                            +720 kJ
              CO2(g) 2(g)  CO2(g)
              C(s) + O C(s) + O2(g)                DH   =   - 390
                                                            +390 kJ




              C(g) + 2O(g)  CO2(g)               DH = -1360 kJ



Smith, Smoot, Himes, pg 141
In football, as in Hess's law, only the initial and final conditions matter.
A team that gains 10 yards on a pass play but has a five-yard penalty,
has the same net gain as the team that gained only 5 yards.

                              10 yard pass




                        5 yard net gain

                                                5 yard penalty



                      initial position    final position
                           of ball            of ball
 Conversion Factors

Conversions




Conversions




     http://www.unit5.org/christjs/tempT
         27dFields-Jeff/Matter1.htm
Atoms, Mass, and the Mole

  Atoms, Mass, and the Mole




  Atoms, Mass, and the Mole key




        http://www.unit5.org/christjs/tempT
            27dFields-Jeff/Matter1.htm
Mole Pattern




http://www.unit5.org/christjs/tempT
    27dFields-Jeff/Matter1.htm

				
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