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CHM152GW7 S09

Chemistry (MasteringChemistry Series)

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CHM 152 Group Work 7 Crib 1. Predict whether the entropy change will be positive or negative for the following: a. H 2 O (g) J H 2 O (l) Δ S______ b. C 6 H 12 O 6 (s) J 2C 2 H 5 OH(l) + 2CO 2 (g) Δ S______ c. 2NH 3 (g) + CO 2 (g) J H 2 O(l) + NH 2 CONH 2 (aq) Δ S______ d. NaCl(s) J NaCl(aq) Δ S______ e. Cu(s) (100 o C) J Cu(s) (25 o C) Δ S______ f. 2NH 3 (g) ' N 2 (g) + 3H 2 (g) Δ S______ 2. Calculate Δ H o rxn, Δ S o rxn and Δ G o rxn for Mg(s) + O 2 (g) ' MgO(s)) (Hint – balance the rxn) 3. From # 2 the results for Δ H o rxn means (exothermic or endothermic), the results for Δ S o rxn means (disorder or
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Unformatted text preview: order) increased, and Δ G o rxn means (products or reactants) are favored under standard conditions. 4. Calculate K for MgCO 3 (s) ' MgO(s) + CO 2 (g) 5. Calculate the temperature at which this reaction changes from being spontaneous to non spontaneous: Mg(s) + O 2 (g) ' MgO(s). Is the reaction spontaneous above or below this temperature? 6. Calculate Δ G for Mg(s) + O 2 (g) ' MgO(s) at 30.5 o C if the pressure of oxygen gas is 1.33 atm....
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