Final exam ChE 350 F09

# Final exam ChE 350 F09 - ChE 350 Fall 2009 Final Exam (Show...

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ChE 350 Fall 2009 Final Exam (Show your work) (150 points total; each question is worth 50 pts.) Name:___________________________ 1 1. (a) Compute the voltage at 25 o C of an electrochemical cell consisting of pure lead immersed in a 0.05 M solution of Pb 2+ ions, and pure tin in a 0.25 M solution of Sn 2+ ions. [ V 0592 . 0 = F RT at 25 o C; V 126 . 0 0 = Pb V ; V 136 . 0 0 = Sn V ] Answer: ____________ (b) Write the spontaneous electrochemical reaction.

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ChE 350 Fall 2009 Final Exam (Show your work) (150 points total; each question is worth 50 pts.) Name:___________________________ 2 2. A steel wire is stretched with a stress of 70 MPa at 20 o C. If the length is held constant, to what temperature must the wire be heated to reduce the stress to 17 MPa? [Consider the elastic modulus of steel to be temperature independent and equal to 207 GPa; the linear thermal expansion coefficient is () 1 o 6 C 10 12 × .] Answer: ____________
ChE 350 Fall 2009 Final Exam (Show your work) (150 points total; each question is worth 50 pts.) Name:___________________________ 3 3. Aluminum has fcc crystal structure. Its molecular weight is 26.982 g/mol and density is 2.7 g/cm 3 .

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## This note was uploaded on 12/13/2011 for the course CHE 350 taught by Professor Sanchez during the Spring '08 term at University of Texas.

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Final exam ChE 350 F09 - ChE 350 Fall 2009 Final Exam (Show...

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