Interpretation:
Percent of CFC represented by 272 ppt needs to be determined if percent means parts per hundred.
Concept introduction:
Chlorofluorocarbon is composed of three elements of the periodic table, chlorine, fluorine and carbons. It does not occur naturally, it can only be obtained in laboratory. It is a non-toxic and stable gas because it does not react with other substances.

Answer to Problem 32A
Explanation of Solution
Parts per thousand (ppt) or parts per hundred or parts per trillion is a ratio which is used to calculate the concentration of solutes in solutions.
Hence, percent represented by 272 ppt if percent means parts per hundred:
Thus,
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