Note: I assume you meant Cl2 , not C12 .
From the kinetic theory we know that effusion rate of component i is proportional to it's molar mass (it's known as Graham's Law)
Qi∼Mi1 Thus
QF2QCl2=MCl2MF2=MClMF=35.446[molg]18.998[molg]≈0.732
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