Homework 4-4.pdf

# Homework 4-4.pdf - Problem Set 3 April 9 2017 Answers are...

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Problem Set 3 April 9, 2017 Answers are due at the beginning of class Friday April 13, 2017. Answer sets received after 8:00 am will not be graded. 1) Given the following standard reduction potentials which material is the easiest to reduce? Al 3+ + 3 e Al E° = – 1.66 V Cu + + e Cu E° = 0.52 V Fe 3+ + e Fe 2+ E° = 0.77 V 2H + + 2 e H 2 (g) E° = 0.00 V Hg 2+ + 2 e Hg (l) E° = 0.78 V Mg 2+ + 2 e Mg E° = – 2.37 V Mn 2+ + 2 e Mn E° = – 1.18 V Zn 2+ + 2 e Zn E° = – 0.76 V 2) The reduction potentials for cupric and cuprous ions are: Cu + + e Cu E 0 = 0.52 V Cu 2+ + 2e Cu E 0 = 0.34 V What would be the potential of a voltaic cell made from these two half reactions and assuming the ion concentrations are equal? 3) Carbon dioxide has n permanent dipole and yet it absorbs in the infrared. Explain briefly why this is so. 4) What kind of compound do you think this is the IR spectrum of? 5) The vibrational frequency of HBr is 2649.7 cm-1. What is the force constant of the HBr bond assuming the molecule behaves as a simple harmonic oscillator?

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