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.

The root mean squared velocity for CF2Cl2 is  

Explanation:

From the question we are told that

         The temperature is

Root Mean Square velocity is mathematically represented as

 Where  T is the temperature

              MW is the molecular weight of gas

              R is the gas constant with a value of  

For  CF2Cl2 its molecular weight is  0.121 kg/mol

     Substituting values

The velocity of freon-12 is 207.0998 m/s

Explanation:

The molar mass of freon-12=120.91g/mol=0.1209kg/mol

The root-mean-square velocity of Freon-12 is:

Where

R=8.31J/K mol

T=-65°C=208K

Replacing:

i'm pretty sure its b i might be wrong though!

increased stability in the completion of fluorine's outer shell.