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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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