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The coolant usually contains a solution of antifreeze prepared by mixing equal volumes of ethylene glycol, `C_2 H_4 (OH)_2` and water. The density of ethylene glycol is 1.113 g/mL. Calculate the f.p. of the mixture. `K_f` for `H_2O` is 1.86.

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`-33.4^@C`
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