What is the ratio of effusion for F 2 aas to Cl 2 aas?

Answer: Graham's law of gaseous effusion states that the rate of effusion goes by the inverse root of the gas' molar mass. râšM = constant Therefore for two gases the ratio rates is given by: r1 / r2 = âš (M2 / M1) For Cl2 and F2: r (Cl2) / r (F2) = âš{ (37.9968) / (70.906) } = 0.732 (to 3. s. f.)