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

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