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The mass of 12.4 molecules of carbon tetrachloride is 3.03 x 10^-22 g. To calculate this, we can use the following formula: mass = number of molecules x molar mass. The molar mass of carbon tetrachloride is 153.82 g/mol. So, the mass of 12.4 molecules of carbon tetrachloride is 12.4 x 153.82 g/mol = 3.03 x 10^-22 g.