Question 8 A student was experimenting with density to find the percent composition of an unknown mixture of ethanol and water. He found the mass of a beaker to be 25.439 g and then pipetted exactly 10.000 mL of his mixture into it with a volumetric pipette. The combined mass of the beaker and solution was 34.992 g. The experiment took place at 20.0°C Temperature (C) Density Water (g/mL) Density Ethanol (g/mL) 16.0 0.998943 0.79283 17.0 0.998774 0.79198 18.0 0.998595 0.79114 19.0 0,998405 0.79029 20.0 0.998203 0.78945 21.0 0.997992 0.78860 22.0 0.997770 0.78775 23.0 0.997538 0.78691 24.0 0.997296 0.78606 25.0 0.997044 0.78522 At this temperature, the density of pure water is Select v g/mL while the density of pure ethanol is Sclect g/mL. The mass of solution used in this experiment is ISclect] grams. The density of the mixture is therefore Select] Yig/mL. The mixture must, contain | Select] ethanol.

Question 8 A student was experimenting with density to find the percent composition of an unknown mixture of ethanol and water. He found the mass of a beaker to be 25.439 g and then pipetted exactly 10.000 mL of his mixture into it with a volumetric pipette. The combined mass of the beaker and solution was 34.992 g. The experiment took place at 20.0°C Temperature (C) Density Water (g/mL) Density Ethanol (g/mL) 16.0 0.998943 0.79283 17.0 0.998774 0.79198 18.0 0.998595 0.79114 19.0 0,998405 0.79029 20.0 0.998203 0.78945 21.0 0.997992 0.78860 22.0 0.997770 0.78775 23.0 0.997538 0.78691 24.0 0.997296 0.78606 25.0 0.997044 0.78522 At this temperature, the density of pure water is Select v g/mL while the density of pure ethanol is Sclect g/mL. The mass of solution used in this experiment is ISclect] grams. The density of the mixture is therefore Select] Yig/mL. The mixture must, contain | Select] ethanol.

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter13: The Chemistry Of Solutes And Solutions

Section: Chapter Questions

Problem 107QRT

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