chem1001S09Q3-1 - CHEM 1001 S QUIZ # 3 August 14, 2009 NAME...

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CHEM 1001 S QUIZ # 3 NAME ______________________________ August 14, 2009 75 min St # ___________________________ DATA F = 96,485 C mol -1 R = 8.3144 J K -1 mol -1 at 298K RT/nF ln Q = 0.0592/n log Q 2.303RT = 5.7 kJ/mol at 298 K ln X = 2.303 log X Coulomb volt = Joule amp = coulomb/sec 1.[10 mk] a) Predict the signs of G, H and S for the following at 298 K and 1 atm. i) C 3 H 8 (g) + 5 O 2 (g) C 4 H 2 O (l) + 3 CO 2 (g) ΔG o __________ ΔH o _______ ΔS o _________ (burning propane) ii) I 2 (s) C I 2 (g) ΔG o __________ ΔH o _______ ΔS o _________ (subliming iodine) iii) For I 2 (s) Tables give ΔG o f = 0 and ΔH o f = 0 kJ mol -1 and S o = 260.7 Jmol -1 K -1 at 298 K . Explain why ΔG o does not equal ΔH o - T Δ S o b) Give the oxidation number for N in KNO 2 ________ HNO 3 _________ NH 4 + _________ Cr in K 2 Cr 2 O 7 _______ in Cr(NO 3 ) 3 __________ CrO 4 2- _______ c) Give the balanced chemical reaction whose ΔH o f corresponds BY DEFINITION to the standard enthalpy of formation of cupric carbonate, CuCO 3 (s) at 298 K. .
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2. [10 mk] Complete and balance ANY TWO of the following reactions.
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chem1001S09Q3-1 - CHEM 1001 S QUIZ # 3 August 14, 2009 NAME...

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