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

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 $\degree$ C.

A) 20 m/s
B) 120 m/s
C) 210 m/s
D) 260 m/s
E) 4.4 * 10⁴ m/s