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Physical Chem Notes-Practice 15

Physical Chem Notes-Practice 15 - Exercises to prepare for...

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Exercises to prepare for Feedback #2 A) Compute the ionic strength and mean ionic activity coefficient these aqueous solutions: i) 10 -3 molal KBr ii) 10 -4 molal CuSO 4 iii) 10 -4 molal (Cu) 3 (PO 4 ) 2 NOTE: If you get the wrong ionic strength, you may not be understanding molality! B) What is standard reduction potential for the half-reaction Ag 2+ + 2 e - Ag (s) ? Note: you cannot add standard reduction potentials, only the corresponding Δ G ° values! ANSWERS TO (A) and (B) are at the bottom of the page --------------------------------------------------------------------------------------------------------------------- The numbers refer to the Exercises (not Problems) in Physical Chemistry , 8 th Edition , by Peter Atkins and Julio De Paula. Numerical answers for the (b) exercises these are available in the back of the textbook, and more complete answers are in the Student Solutions Manual. 5.18 and 5.19 7.14* Also, compute Δ G ° r for each reaction 7.15 7.17 Be sure to solve this from the standard reduction potentials, NOT from standard Gibbs Free Energies of formation!
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