Question

21. Which of the following statements is always true? a) Spontaneous processes increase system entropy b) Spontaneous processes decrease system entropy c) Spontaneous processes can decrease or increase system entropy d) Spontaneous processes lead to no change in system entropy e) None of these statements is always true. 22. Use the standard molar enthalpies of formation and calculate the change in enthalpy for the reaction: 2CH3OH (l) + 3O2 (g) ? 2CO2 (g) + 4H2O (l) a) -940 kJ b) 130 kJ c) 1450 kJ d) -1453 kJ e) 206 kJ CH3OH(l): -238.4 kJ/mol O2(g): 0 kJ/mol CO2(g): -393.5 kJ/mol H2O(l): -285.83 kJ/mol 23. The thermodynamic quantity that expresses the degree of disorder in a system is ______. A) enthalpy B) internal energy C) bond energy D) entropy 24. The process that leads to an increase in entropy is . A) melting B) freezing C) condensation D) cooling 25. Entropy decreases during . A) sublimation B) vaporization C) condensation

          21. Which of the following statements is always true?
a) Spontaneous processes increase system entropy
b) Spontaneous processes decrease system entropy
c) Spontaneous processes can decrease or increase system entropy
d) Spontaneous processes lead to no change in system entropy
e) None of these statements is always true.

22. Use the standard molar enthalpies of formation and calculate the change in enthalpy for the reaction: 2CH3OH (l) + 3O2 (g) ? 2CO2 (g) + 4H2O (l)
a) -940 kJ
b) 130 kJ
c) 1450 kJ
d) -1453 kJ
e) 206 kJ

CH3OH(l): -238.4 kJ/mol
O2(g): 0 kJ/mol
CO2(g): -393.5 kJ/mol
H2O(l): -285.83 kJ/mol

23. The thermodynamic quantity that expresses the degree of disorder in a system is __________.
A) enthalpy
B) internal energy
C) bond energy
D) entropy

24. The process that leads to an increase in entropy is ____.
A) melting
B) freezing
C) condensation
D) cooling

25. Entropy decreases during ____.
A) sublimation
B) vaporization
C) condensation

21. Which of the following statements is always true?
a) Spontaneous processes increase system entropy
b) Spontaneous processes decrease system entropy
c) Spontaneous processes can decrease or increase system entropy
d) Spontaneous processes lead to no change in system entropy
e) None of these statements is always true.

22. Use the standard molar enthalpies of formation and calculate the change in enthalpy for the reaction: 2CH3OH (l) + 3O2 (g) ? 2CO2 (g) + 4H2O (l)
a) -940 kJ
b) 130 kJ
c) 1450 kJ
d) -1453 kJ
e) 206 kJ

CH3OH(l): -238.4 kJ/mol
O2(g): 0 kJ/mol
CO2(g): -393.5 kJ/mol
H2O(l): -285.83 kJ/mol

23. The thermodynamic quantity that expresses the degree of disorder in a system is .
A) enthalpy
B) internal energy
C) bond energy
D) entropy

24. The process that leads to an increase in entropy is .
A) melting
B) freezing
C) condensation
D) cooling

25. Entropy decreases during .
A) sublimation
B) vaporization
C) condensation

Added by Jerry A.

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