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3615SU03QS06 - pure liquid A respectively and x A is the...

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Quiz #6 CHEM 3615 06/26/03 Name: ___________________ ID#: _____________________ Question 1: (2 points) Draw a plot of the chemical potential µ versus temperature T for a pure substance showing regions for the solid, liquid and vapor states. Show the temperatures of fusion and boiling. Then on the same diagram, using dotted curve(s) plot the chemical potential versus temperature for a substance A existing in a mixture with a component B. B is not volatile and does not mix with A in the solid crystalline state. SEE PLOT IN YOUR BOOK PAGE 175 Question 2: (2 points) Using an equation, state Raoult’s law for substance A. Define the terms you use. P A = P A * x A where P A and P A * are the vapor pressures of A above the mixture and above the
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Unformatted text preview: pure liquid A, respectively, and x A is the mole fraction of A Question 3: (2 points). Give the relationship between activity, activity coefficient and mole fraction. a A = γ A x A where γ A is the activity coefficient and x A is the mole fraction of A Question 4: (2 points). Give the equation relating the chemical potential of a substance A to the chemical potential of that substance in its reference state, to the temperature T and to the activity of this substance. µ A = µ A + RT ln (a A ) Question 5: (2 points). Write the equation relating the equilibrium constant K to the relevant activities for the following reaction: 3 H 2(g) + N 2(g) → 2 NH 3(g) ( ) ( ) ( ) 2 3 2 3 2 H a N a NH a K =...
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