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A sample of an ethanol-water solution has a volume of 55.0  cm^3 and a mass of 50.0  g. What is the percentage of ethanol (by mass) in the solution? Assume that there is no change in volume when the pure compounds are mixed. The density of ethanol is 0.80  g / cm^3 and that of water is 1.00  g / cm^3. (a) 20 % (b) 40 % (c) 60 % (d) 45.45 % | Numerade
A sample of an ethanol-water solution has a volume of 55.0  cm^3 and a mass of 50.0  g. What is the percentage of ethanol (by mass) in the solution? Assume that there is no change in volume when the pure compounds are mixed. The density of ethanol is 0.80  g / cm^3 and that of water is 1.00  g / cm^3. (a) 20 % (b) 40 % (c) 60 % (d) 45.45 % | Numerade
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If 50.0 mL of ethanol (density 0.789 g/mL) initially at 9.0 °C is mixed with 50.0 mL of water (density 1.0 g/mL) initially at 28.6 °C in an insulated beaker, what is the final temperature of the mixture, assuming that no heat is lost? (Cethanol = 2.42 J/(g°C)). Express the temperature in degrees Celsius to three significant figures.
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