Chapter 17, Problem 48P

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(b) Problem 10-33 Draw resonance structures for the following species: + (a) CH3CH=CHCH=CHCH=CHCH2 + (c) CH3C=N-Ö CS Scanned with CamScanner 1 4

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Calculate ΔHf0 of HPO3 given the data below                                          P4O10  +  4 HNO3   ---->  4 HPO3   +  2 N2O5                ΔHorxn = -180.6 kJ             ΔHf0  (kJ/mol)     -2984        -174.1                  x                -43.1

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Use ΔHf0  listed below to calculate ΔH0rxn for  the reaction                                                                           C     +   4 HNO3  ---->  CO2     +  4 NO2   +   2 H2O                                             ΔHf0  (kJ/mol)        0            -174.1         -393.5         33.2          -285.8

3) A redox titration: 160.00 mL of 0.0500 M Sn2+ solution was titrated with 0.200 M Ce according to the reaction below. Buret containing Ce Calomel reference electrode. 0.00500 M Sn Magnetic stirring bar Titration reaction: 2 Ce++ Sn2+-------> 2 Ce3+ + Sn4+ Eº Cee-------> Ce3+ Sn+ + 2e------> Sn²+ 1.470 V 0.139 V a) What is V. (the equivalence volume) (of Ce") needed to reach the endpoint? b) Calculate the potential (voltage), when 10.00 mL Ce" is added. c) What is the cell potential at the equivalence point? d) What is the cell potential when 60 mL Ce4+ is added? SCE = +0.241 V

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How many grams of CO2 are produced per 1.00 x 104 kJ of heat released by the combustion of butane, C4H10?             2 C4H10 + 13 O2  ---->   8 CO2   +  10 H2O                    ΔHorxn = -5314 kJ