Unformatted text preview: C3(t) be the concentration between 1990 and 1993, and let C4(t) be the concentration
after the beginning of 1994. Assume t = 0 corresponds to 1960. Solution #5: = Concentration between 199093
= Concentration after beginning of 1994
t (0) = Corresponding to year 1996
Given CFC mass emission (P) = 1.9
gram per year
Molecular weight of CFC11 = 136 grams per mole
Now,
g
( ⁄ )
( ( )⁄
( ( Hence ⁄ ( ) )
)⁄ )+ ( ( )⁄ ( ) )⁄ From 1993 onwards emission is ignored, hence
( Therefore,
This gives, ( )= )
( ( (
( )⁄ ) )⁄ ( ( )
)⁄ ) ( )⁄ 6. In Example 11.9 you were given the average production rate of CFC11 as 3.1
g/year for the 20 years 19701989. The emission rate was assumed...
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This note was uploaded on 02/06/2014 for the course ENG 9624 taught by Professor Tahirhusain during the Spring '13 term at Memorial University.
 Spring '13
 TahirHusain

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