Spring '11 Exam 3 with Answers

# Using δ g o f values calculate δ g o rxn for the

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10. Using Δ G o f values , calculate Δ G o rxn for the above reaction at 298 K? A. 1351.0 kJ B. 342.0 kJ C. 226.6 kJ D. 690.3 kJ E. 1479.1 kJ 11. Assuming that Δ H o f and S o values are independent of temperature, determine at what temperature would the above reaction become reactant favored. * * * 12. Consider the gas-phase reaction of A 2 (dark) and B 2 (light) to form AB 3 . Write the correct balanced equation and determine the sign of Δ S for the reaction. A. A 2 (g) + 3 B 2 (g) àฏ 2 AB 3 (g); Δ S > 0 B. 2 A 2 (g) + 6 B 2 (g) àฏ 4 AB 3 (g); Δ S > 0 C. A(g) + 3 / 2 B 2 (g) àฏ AB 3 (g); Δ S < 0 D. A 2 (g) + 3 B 2 (g) àฏ 2 AB 3 (g); Δ S < 0 E. 2 A 2 (g) + 6 B 2 (g) àฏ 4 AB 3 (g); Δ S < 0

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5 13. From the following Δ H o and Δ S o values predict which reactions are product favored at 373 K. Δ H o (kJ) Δ S o (J/K) (i) +10.5 +30 (ii) 10.0 10 (iii) 5.0 25 14. For the deposition process shown below (gas àฏ solid phase change that takes place in just one step), determine the sign of the entropy change of the surroundings , Δ S surr , as well as provide the correct justification. Note: both parts of your answer must be correct for credit.
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• Spring '10
• Gallagher

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