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quiz laude pg 1 - Lee Sam Quiz 5 Due 4:00 pm Inst David...

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Lee, Sam – Quiz 5 – Due: Nov 20 2007, 4:00 pm – Inst: David Laude 1 This print-out should have 8 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. The due time is Central time. 001 (part 1 of 1) 5 points Which of the following has the largest posi- tional entropy at 0 K? 1. three BCl 2 F molecules correct 2. two NH 3 molecules 3. four CO molecules 4. eight CCl 4 molecules 5. sixteen O 2 molecules Explanation: 002 (part 1 of 1) 5 points Calculate the standard reaction enthalpy for the reaction of calcite with hydrochloric acid CaCO 3 (s) + 2 HCl(aq) -→ CaCl 2 (aq) + H 2 O( ) + CO 2 (g) The standard enthalpies of formation are: for CaCl 2 (aq) : - 877 . 1 kJ / mol; for H 2 O( ) : - 285 . 83 kJ / mol; for CO 2 (g) : - 393 . 51 kJ / mol; for CaCO 3 (s) : - 1206 . 9 kJ / mol; and for HCl(aq) : - 167 . 16 kJ / mol. 1. - 165 kJ/mol 2. - 38 . 2 kJ/mol 3. - 215 kJ/mol 4. - 72 . 7 kJ/mol 5. - 98 . 8 kJ/mol 6. - 116 kJ/mol 7. - 15 . 2 kJ/mol correct Explanation: We use Hess’ Law: Δ H = X n Δ H j , prod - X n Δ H j , reac = Δ H f , CaCl 2 (aq) + Δ H f , H 2 O(
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