3 Entholpy, Entropy, and Free Energy Worksheet 12. Find S for the reaction, 2 NO

Question

3 Entholpy, Entropy, and Free Energy Worksheet 12. Find S for the reaction, 2 NO(g) + dms) 2 NC)2(g. A. -146.5 J/ B. +146.5 J/K c. -16.5 J/ D. +16.5J/K E. None of these. 12. Find GR for the reaction, 2 H2O(g) +2 F2W" 02(g) + 4 H Fu. A. -1550.0 kJ B. +1550.0 k C. -635.6 k D. +635.6kJ E. None of these. 13. What is the change in enthalpy for 4 Al(.) +3 02(g) 2 Al 200)? A. 0 kJ B.-1657.7 kJ C. +1657.7 kJ D. +3351.4 kJ E. -3351.4 kJ 14. What is the change in entropy for 4 Al(a) +3 Oas) 2 Alt.)? A. 0 J/K B. -626.7 J/K C. +626.7 J/K D. -500.0 J/K E. +500.0 J/K 15.Use the results from questions 14 and 15 to determine under what conditions this reaction will be spontaneous A. This reaction will be spontaneous at all temperatures. B. This reaction will never be spontaneous at any temperature. C. This reaction will be spontaneous at high temperatures. D. This reaction will be spontaneous at low temperatures

Explanation / Answer

12)

we have:

Sof(NO(g)) = 210.76 J/mol.K

Sof(O2(g)) = 205.138 J/mol.K

Sof(NO2(g)) = 240.06 J/mol.K

we have the Balanced chemical equation as:

2 NO(g) + O2(g) ---> 2 NO2(g)

deltaSo rxn = 2*Sof(NO2(g)) - 2*Sof( NO(g)) - 1*Sof(O2(g))

deltaSo rxn = 2*(240.06) - 2*(210.76) - 1*(205.138)

deltaSo rxn = -146.538 J/K

Answer: A

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