Catalytic Converter

Smoot, Smith, Price, Chemistry A Modern Course, 1990, page 454

N O

N O

N O

N O

N O

NO

N

O

NO

N O

N

O

N

O

O ON

NO

O

OO

N NNN

One of the reactions that takes place in the catalytic converter is the decomposition of nitrogen (II) oxide (NO) to nitrogen and oxygen gas.

N O

O

Catalytic Converter

C O

N O

CO

OCO

NN

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.

CO

N

NN

OO

OC

OCO

2 CO(g) + 2 NO(g) N2(g) + 2 CO2(g)catalyst

Enthalpy Diagram

H2O(g)H2O(g)

H2O(l)H2O(l)

H2(g) + ½ O2(g)

-44 kJExothermic

+44 kJEndothermic

H = +242 kJEndothermic

242 kJExothermic

286 kJEndothermic

H = -286 kJExothermic

Ene

rgy

H2(g) + 1/2O2(g) H2O(g) + 242 kJ H = -242 kJKotz, Purcell, Chemistry & Chemical Reactivity 1991, page 211

Hess’s LawCalculate the enthalpy of formation of carbon dioxide from its elements.

C(g) + 2O(g) CO2(g)

Use the following data:2O(g) O2(g) H = - 250 kJC(s) C(g) H = +720 kJCO2(g) C(s) + O2(g) H = +390 kJ

Smith, Smoot, Himes, pg 141

2O(g) O2(g) H = - 250 kJ

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

C(g) C(s) H = - 720 kJC(s) + O2(g) CO2(g) H = - 390 kJ

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.

initial positionof ball

final positionof ball

10 yard pass

5 yard penalty

5 yard netnet gain

http://www.unit5.org/christjs/tempT27dFields-Jeff/Matter1.htm

Conversion Factors

Conversions

Conversions

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Atoms, Mass, and the Mole

Atoms, Mass, and the Mole

Atoms, Mass, and the Mole  key

http://www.unit5.org/christjs/tempT27dFields-Jeff/Matter1.htm

Mole Pattern