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Con el fin de disminuir la temperatura de ebullición del agua contenida en un depósito, se disuelven en el mismo y en una concentración del 3% en peso, una sustancia de formula empírica (C2H6O)n, originándose un descenso en la presión de vapor, a 20 °C, de 0,209 mmHg. ¿Cuál es la temperatura de congelación de dicha disolución?
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