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Unformatted text preview: ECH 152B Homework #7 Due: Monday March 15, 2010 1) (30 points) The case I behavior for SLE (section 14.6) has an analog for VLE. Develop the analogy. 2) (30 points) Use results of Section 14.6 to develop the following approximate rules of thumb: a. The solubility of a pure solid in a liquid solvent increases with increasing T. Carefully state assumptions. b. The solubility of a pure solid in a liquid solvent is independent of the identity of the solvent species. c. Of two solids with roughly the same heat of fusion, that solid with the lower melting point is the more soluble in a given liquid solvent at a given T. d. Of two solids with similar melting points, that solid with the smaller heat of fusion is the more soluble in a given liquid solvent at a given T. (3) (40 points) Determine the standard reversible cell potential (E) when H2 and O2 are used as fuel and oxidant, respectively, with the following fuel cell reaction H2 +1/2O2 H2O Obtain the result by considering the product H2O is (a) in the liquid state, and (b) in the vapor state, respectively. At 25C and 1 atm: Hf (H2) = 0 J/mol Hf (O2) = 0 J/mol Hf (H2O, l) = 285,826 J/mol Hf (H2O, g) = 241,826 J/mol S (H2) = 130.68 J/molK S (O2) = 205.14 J/molK S (H2O, l) = 69.92 J/mol S (H2O, g) = 188.83 J/mol ...
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This document was uploaded on 06/16/2010.
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