A certain mass of a substance in 100 g o...

A certain mass of a substance in 100 g of `C_6H_6` lowers the f.p. by `1.28^@C`. The same mass of the substance in 100 g of water lowers the f.p. by `1.395^@C` . If the substance has a normal molecular weight in `C_6H_6` and is completely dissociated in water, calculate the number of moles of ions produced by the dissociation of 1 mole of the substance in water. `K_f` for `H_2O` and `C_6H_6` are 1.86 and 5.00 respectively.

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