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Vodka is advertised to be 80 proof. That means that the ethanol () concentration is 40.00 % by volume. Assuming that the density of the solution is 1.0 g ml^{-1}, what is the freezing point of vodka? The density of ethanol is 0.789 g ml^{-1}. The cryoscopic constant () of water is 1.853 ^{o}C kg mol^{-1}.
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