1. A gas X, effuses 0.629 times as fast as O2 (g) under the same condition. What is the molecular mass of gas X? 2. At what temperature would the root-mean square velocity of the F2 ( molecule equal to the root-mean velocity of the Cl2 ) molecule at 400.0 K? 3. Compare the rate of effusion of F2 with that of Cl2 under the same conditions.

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