CHEM 123 Unit 4 Test Blueprint Key

Nitric oxide reacts with chlorine to form nocl the

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14) Nitric oxide reacts with chlorine to form NOCl. The data refer to 298 K. 2NO( g ) + Cl 2 ( g ) 2NOCl( g ) Substance: NO( g ) Cl 2 ( g ) NOCl( g ) H f (kJ/mol): 90.29 0 51.71 S (J/K·mol): 210.65 223.0 261.6 What is the value of G for this reaction at 550 K? Assume a negligible change in H rxn and S rxn with temperature. 15) Calculate the value of ΔS for the following reaction at 25 o C: C 2 H 4 (g) + 3O 2 (g) 2CO 2 (g) + 2 H 2 O (g) ΔG = 1314 kJ ΔH f (C 2 H 4 (g)) = 52.4 kJ/mol ΔH f (CO 2 (g)) = -393.5 kJ/mol ΔH f (H 2 O (g)) = -241.8 kJ/mol a) -12.5 J/mol·K b. -30.2 J/mol·K c. -42.6 J/mol·K d.-58.7 J/mol·K e. -95.6 J/mol·K Know how sign of ΔG, sign of E, and value of K indicate spontaneity. Be able to indicate based on signs of enthalpy and entropy changes how temperature will affect spontaneity and/or calculate temperature are which spontaneity changes.
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