PL%20Worksheet%201

PL%20Worksheet%201 - high vapor pressure Justify your...

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CHEM 1212 PL Worksheet #1 Physical States and Phase Changes (12.1) 1. Ethanol has a ΔH vapor of 40.5 kJ/mol and a ΔH fusion of 5.0 kJ/mol. How much energy would it take to condense 125 g of ethanol that is originally a gas at the boiling point? The molecular formula for ethanol is C 2 H 6 O. 2. How much energy would it take to lower the temperature of the condensed ethanol in question 1 to 35.0 Celsius? Ethanol boils at 78.4 Celsius and the liquid ethanol has a specific heat of 2.44 J/g-C. 3. Estimate the H subl and H depo for ethanol. 3. Describe the relationship between vapor pressure and temperature. What can be done to temperature to slow down the evaporation of a liquid? 4. Using the definition of vapor pressure in class, an ice cube would have: no vapor pressure low vapor pressure
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Unformatted text preview: high vapor pressure Justify your answer: CHEM 1212 5. An unknown liquid has a vapor pressure of 0.02530 atm at 45.03 Celsius. The H vap of the liquid is 34.50 kJ/mol. At what temperature, would this liquid have a vapor pressure of 1.000 atm? 6. Review your answer to #3. Does your answer to #5 support the relationship you described? 7. For a closed system that holds a liquid and vapor in equilibrium, circle each answer below that is an accurate description (more than one may be correct): A) The amount of liquid will remain constant B) The amount of vapor will remain constant C) The amount of liquid will equal the amount of vapor D) The ratio of liquid to vapor will remain constant E) The rate of evaporation will equal the rate of condensation...
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This note was uploaded on 11/29/2011 for the course CHEM 1212 taught by Professor Dockery during the Fall '08 term at Kennesaw.

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PL%20Worksheet%201 - high vapor pressure Justify your...

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