3. At room temperature, the partial molar volume of water and ethanol in a solution with a molar fraction of alcohol of 0.2 is 17.9 and 55 cm3/mol, respectively. The density of water and alcohol at the same temperature is 0.998 and 0.789 g/cm3. To prepare 100 ml of such a solution, water will be required (ml) (give the answer as a whole number).
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