Freon-12, CF₂Cl₂, Which Has Been Widely Used in Air Conditioning

question 89

Multiple Choice

Freon-12, CF₂Cl₂, which has been widely used in air conditioning systems, is considered a threat to the ozone layer in the stratosphere. Calculate the root-mean-square velocity of Freon-12 molecules in the lower stratosphere where the temperature is −65°C.

• A)20 m/s
• B)120 m/s
• C)210 m/s
• D)260 m/s
• E)4.4 × 10 ⁴ m/s

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