ChapterTweleveReview - 12review Student: _ 1. Pentane,...

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12review Student: ___________________________________________________________________________ 1. Pentane, C 5 H 12 , boils at 35°C. Which of the following is true about kinetic energy, E k , and potential energy, E p , when liquid pentane at 35°C is compared with pentane vapor at 35°C? A. E k ( g ) < E k ( l ); E p ( g ) E p ( l ) B. E k ( g ) > E k ( l ); E p ( g ) E p ( l ) C. E p ( g ) < E p ( l ); E k ( g ) E k ( l ) D. E p ( g ) > E p ( l ); E k ( g ) E k ( l ) E. E p ( g ) E p ( l ); E k ( g ) E k ( l ) 2. A sample of octane in equilibrium with its vapor in a closed 1.0-L container has a vapor pressure of 50.0 torr at 45°C. The container's volume is increased to 2.0 L at constant temperature and the liquid/vapor equilibrium is reestablished. What is the vapor pressure? A.> 50.0 torr B.50.0 torr C.25.0 torr D.The mass of the octane vapor is needed to calculate the vapor pressure. E.The external pressure is needed to calculate the vapor pressure. 3. The phase diagram for xenon has a solid-liquid curve with a positive slope. Which of the following is true? A.Solid xenon has a higher density than liquid xenon. B.Solid xenon has the same density as liquid xenon. C.The phase diagram cannot be used to predict which phase of xenon is denser. D.Freezing xenon is an endothermic process. E.None of these statements is true. 1
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4. Diethyl ether, used as a solvent for extraction of organic compounds from aqueous solutions, has a high vapor pressure which makes it a potential fire hazard in laboratories in which it is used. How much energy is released when 100.0 g is cooled from 53.0°C to 10.0°C? boiling point
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This homework help was uploaded on 04/20/2008 for the course CHEM 1300/ taught by Professor Ballester during the Fall '08 term at Nova Southeastern University.

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ChapterTweleveReview - 12review Student: _ 1. Pentane,...

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