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First, C2F3Cl3 has a molar mass of 187.38 g/mole. So there are 117.41 moles of this compound. By ratio, then there are 352.23 moles of chlorine. Chlorine has a molar mass of 35.453 g/mole, so there are 12.488 kg of chlorine in that compound. CF3Cl has a molar mass of 104.46 g/mol = 210.61 moles. By ratio, there are an equivalent number of moles of chlorine, so there is 7.467 kg of chlorine in the second compound.
since Kg means kilograms there are 25 kilograms in 25 Kg of C2F3Cl3 This sounds like a trick question to me or it wasn't asked properly.