iPad 10:27 AM @ 19% D PEARSON 882 Chapter 18: Free Energy and Problems by Topic
ID: 591830 • Letter: I
Question
iPad 10:27 AM @ 19% D PEARSON 882 Chapter 18: Free Energy and Problems by Topic Pearson eText 2.0 X eText 2.0 MEW the Equilibrium Constant 69. Consider the sublimation of iodine at 25.0 °C: 12(s) 12(9) a. Find xn at 25.0 °C. b. Find AGr at 25.0 °C under the following nonstandard conditions i, B'= 1.00 mmHg ii· A, = 0.100 mnnHg c. Explain why iodine spontaneously sublimes in open air at 25.0 °C 70. Consider the evaporation of methanol at 25.0 °C: CH,OH(1) CH3OH(g) a. Find G at 25.0°C. b. Find Gr at 25.0 °C under the following nonstandard conditions: i. PeHaOH= 150.0 mmHg ii. PCH,OH 100.0 mnnHg iii. RH,011 = 10.0 mmHg c. Explain why methanol spontaneously evaporates in open air at 25.0 °C. 71 Consider the reaction: CH3OH(g) C0(g) + 2 H2(g) Calculate G for this reaction at 25 °C under the following conditions: CH,OH0.855 atm Ro= 0.125 atm Ph= 0.183 atm ii, iii. 72. Consider the reaction: CO2(g) + CC, (g) 2 COCh(9) Calculate G for this reaction at 25 °C under the following conditions:Explanation / Answer
a)
dG = Gproducts- Greactant
dG = dHvap - Tvap*dSvap
dG = 38.278 - 298*113/1000
dG = 4.604 kJ/mol = 4604 J/mol
b)
dG = dG° + RT*ln(Q)
dG = 4604 +8.314*298*ln(150/760) = 583.68 J/mol
dG = 4604 +8.314*298*ln(100/760) = -420 J/mol
dG = 4604 +8.314*298*ln(10/760) = -6125.703 J/mol
this is only likely to occur if P is low enough , i.e. P = 100 mg or below
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