A platinum catalytic reactor in an automobile is used to convert carbon monoxide to carbon dioxide in an oxidation reaction of the form 2CO ϩ O 2 l 2CO 2 . Species transfer between the catalytic surface and the exhaust gases may be assumed to occur by diffusion in a film of thickness L ϭ 10 mm. Consider an exhaust gas that has a pressure of 1.2 bars, a temperature of 500 Њ C, and a CO mole fraction of 0.0012. If the reaction rate constant of the catalyst is k" = 0.005 m/s and the diffusion coefficient of CO in the mixture is 10-4 m/s, what is the molar concentration of CO at the catalytic surface? What is the rate of removal of CO per unit area of the catalyst? What is the removal rate if kis adjusted to render the process diffusion limited?

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answer:

an example of solubility is salt or sugar dissolving in water.

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the equation above shows how temperature f, measured in degrees fahrenheit, relates to a temperature c, measured in degrees celsius. based on the equation, which of the following must be true?

a temperature increase of 1 degree fahrenheit is equivalent to a temperature increase of

5

9

degree celsius.

a temperature increase of 1 degree celsius is equivalent to a temperature increase of 1.8 degrees fahrenheit.

a temperature increase of

5

9

degree fahrenheit is equivalent to a temperature increase of 1 degree celsius.

a) i only

b) ii only

c) iii only

d) i and ii only