Freon-12 is used as a refrigerant in central home air conditioners. The rate of effusion of Freon- 12 to Freon- 11 (molar mass = 137.4 g/ mol) is 1.07: 1. The formula of Freon-12 is one of the following: CF4, CF3Cl, CF2Cl2, CFCl3, or CCl4. Which formula is correct for Freon-12?
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