20. Which of the following processes would be accompanied by a decrease in entro
ID: 1043511 • Letter: 2
Question
20. Which of the following processes would be accompanied by a decrease in entropy B) HO)H:O(B) E H:O(l, 50°C)-H.00, 75°C) 21. Determine os" for the reaction soog) +1 100) ? HS00). SO H2O 256.2 69.9 156.9 A) 169.2 J/K mol B) 1343.2 J/K-mol C) -169.2J/K mol D) -29.4 J/K mol E) 29.4 J/K mol 22. At 1500°C the equilibrium constant for the reaction CO(g)+2H2(g)CH OH(g) has the value K,-1.4 x 10-7. Calculate ?Go for this reaction at 1500C. A) 105 kJ/mol B) 1.07 kJ/mol C)-233 kJ/mol D) -105 kJ/mol E) 233 kJ/mol 23. Calculate ??" for the combustion of ethanol vapor, C110H(g), at 750°C in oxygen to form carbon dioxide and water vapor. The following data is valid at 25°C: -234.8 -167.9 C2HsOH(g) 02(g) H20(g) CO(g) -241.8 -393.5 -228.6 -394.4 A) -1407 kJ/mol B) -2151 kJ/mol C) -1307 kJ/mol D) -4486 kJ/mol E) -1377 kJ/mol
Explanation / Answer
0. disorder is decreases entropy is decreases.
solid<liquid<gas
D. H2O(g) ----------> H2O(s)
21. SO3(g) + H2O(l) -------> H2So4(l)
DS = Sf products -Sf reactants
= 156.9-(256.2+69.9) = -169.2J/K-mole
C. -169.2J/K-mole
22. T = 1500+273 = 1773K
DG^0 = -RTlnKp
= 8.314*1773ln1.4*10^-7
= 8.314*1773*-15.7816 = -232632J/mole = -233KJ/mole
C.233KJ/mole
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.