Quiz1A._key

Quiz1A._key - Chem 125 Winter 2008 Quiz#1 Alvin Dr Retsek...

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Chem 125 Quiz #1 Alvin Dr. Retsek Winter 2008 NAME: ____ KEY _________________________ 1. (5 points) Using the graph below for an unknown compound A answer the following two questions. Linear Relationship Between Temperature and Pressure for Unknown A y = -5120x + 20.4 R 2 = 0.9986 0 2 4 6 8 0.0025 0.0026 0.0027 0.0028 0.0029 0.003 0.0031 1/Temperature (1/Kelvin) ln P vap (P in units of torr) a. What is the heat of vaporization (in kJ/mole) for unknown A? Clausius-Clapeyron Graph: ln P = - H vap /R (1/T) + C where ln P = y, 1/T = x, - H vap /R = m or slope and C is b or y-intercept - H vap /R = -5120 H vap = -5120 (-8.314J/mole·K) = 42600 J/mole or 42.6 kJ/mole b. Calculate the normal boiling point for unknown A? Boiling point means the temperature where P vap = P external Normal boiling point means the temp where P vap = P external = 1 atm or 760 torr in this case since P is in torr (look to y-axis) Use equation of the line, which is the Clausius-Clapeyron equation where C, and
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This note was uploaded on 04/02/2008 for the course CHEM 125 taught by Professor Retsek during the Winter '08 term at Cal Poly.

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Quiz1A._key - Chem 125 Winter 2008 Quiz#1 Alvin Dr Retsek...

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