Chem6C- Practice Mid 1

Chem6C- Practice Mid 1 - MID-TERM EXAM #1 (Fall, 2003) 1....

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Unformatted text preview: MID-TERM EXAM #1 (Fall, 2003) 1. For a given reaction, if the changes in enthalpy and entropy are both positive: (a) The reaction is always spontaneous. (b) The reaction is spontaneous at low temperatures. (c) The reaction is spontaneous at high temperatures. (d) The reaction is never spontaneous. (e) There is not enough information given to choose among the first four answers. 2. Most liquids follow Troutons Rule which states that the molar entropy of vaporization is approximately 87 J/mol-K ( 5%). For water: H vap is 40.67 kJ/mol at its normal boiling point (100C). Which of the following is true : (a) Water obeys Troutons Rule. (b) S vap for water is lower than predicted by Troutons Rule because water has a higher degree of order than most liquids. (c) S vap for water is higher than predicted by Troutons Rule because water has a higher degree of order than most liquids. (d) S vap for water is lower than predicted by Troutons Rule because water has a lower degree of order than most liquids. (e) S vap for water is higher than predicted by Troutons Rule because water has a lower degree of order than most liquids. 3. Given the following information, which of the following statements is correct about the stability of Fe 2+ in aqueous solution, assuming disproportionation to Fe o and Fe 3+ (aq)? Fe(s) : S = 27.28 J/K mol; Fe 2+ (aq) : H f = -89.1 kJ/mol, G f = -78.9 kJ/mol, S = -137.7 J/K mol Fe 3+ (aq) : H f = -45.5 kJ/mol, G f = -4.7 kJ/mol, S = -315.9 J/K mol (a) Fe 2+ is unstable in water because G rx is positive and equal to74.2kJ/mol. (b)...
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Chem6C- Practice Mid 1 - MID-TERM EXAM #1 (Fall, 2003) 1....

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