CHM2046Quiz5

CHM2046Quiz5 - CHM2046 Quiz 5 Version Answers underlined A...

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CHM2046 Quiz 5 Version A Answers underlined 1A) Calculate S rxn Ο for the following reaction. The S° for each species is shown below the reaction. 22 2 24 C H (g) H (g) C H (g) + S°(J/mol · K) 200.9 130.7 219.3 A) +112.3 J/K B) +550.9 J/K C) -112.3 J/K D) +337.1 J/K E) -550.9 J/K Use S ° rxn = Σ (n S ° prod ) - (n S ° react ) S rxn = 2(219.3) – (200.9 +130.7 ) J/K = -112.3 J/K 2A). Which reaction is likely to have a negative change in entropy? a) 2 NH 3 (g) N 2 (g) + 3 H 2 (g) 2 mol gas 3 mol gas b) CaCO 3 (s) CaO(s) + CO 2 (g) 1 mol gas produced from solid c) NaCl(s) Na + (aq) + Cl - (aq) dissolution of ionic solid d) N 2 O 4 (g) 2 NO 2 (g) 1 mol gas 2 mol gas e) 2 CO(g) 2 C(s) + O 2 (g) 2 mol gas 1 mol gas 3A) Determine G rxn ∆° (25 o C) using the following information. 2 FeO(g) CO(g) Fe(g) CO (g) +→ + H ° = - 11.0 kJ; S ∆ ° = - 17.4 J/K A) +191.0 kJ B) -5.8 kJ C) +1.58 kJ D) -6.40 kJ E) +89.5 kJ Use G ° rxn = H ° - T S ° G ° rxn = -11.0 kJ - (298K × -17.4 J/K)/1000 J = -11.0 kJ + 5.1852 kJ = -5.8 kJ 4A) Determine the equilibrium constant for the following reaction at 298 K.
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CHM2046Quiz5 - CHM2046 Quiz 5 Version Answers underlined A...

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